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Strengthen Drill Pack

10 original strengthen questions with an answer key and explanations. Print-friendly.

Strengthen Drill Pack

10 original LSAT-style questions. Work at your own pace. Answer key on the last page.

Question 1

The city added protected bike lanes downtown, and cyclist injuries fell 35 percent over two years. Officials say the lanes caused the drop.

Which of the following, if true, most strengthens the officials' claim?

  1. A. Car traffic downtown also fell during those two years.
  2. B. Cycling became more popular downtown during those two years.
  3. C. Injuries fell specifically on streets with the new lanes, while streets without them saw no change.
  4. D. The lanes were painted green.
  5. E. Cyclists say they feel safer now.

Answer: ______

Question 2

A researcher claims that reading fiction improves empathy, citing a study where fiction readers scored higher on empathy tests than non-readers.

Which of the following, if true, most strengthens the researcher's claim?

  1. A. Empathetic people are more likely to pick up novels.
  2. B. Participants were randomly assigned to read fiction or nonfiction, and the fiction group's empathy scores rose.
  3. C. Fiction outsells nonfiction most years.
  4. D. Empathy tests are hard to design.
  5. E. The study had only 40 participants.

Answer: ______

Question 3

A restaurant owner believes her new lunch menu increased revenue, pointing to a 20 percent revenue rise since the menu launched.

Which of the following, if true, most strengthens her belief?

  1. A. Food costs also rose 20 percent.
  2. B. A rival restaurant nearby closed the same month the menu launched.
  3. C. Lunch-hour sales rose 40 percent while dinner sales stayed flat.
  4. D. The menu was designed by a famous chef.
  5. E. Customers complain about the wait times.

Answer: ______

Question 4

Maple Street Bakery switched to organic flour in January. Since then, its daily sales have risen 30 percent. The owner believes the organic flour caused the increase.

Which of the following, if true, most strengthens the owner's conclusion?

  1. A. A nearby bakery that did not switch to organic flour also saw sales rise 30 percent.
  2. B. Maple Street Bakery's prices did not change when it switched to organic flour.
  3. C. Organic flour is more expensive than regular flour.
  4. D. Several customers said they came in specifically because of the organic flour.
  5. E. The bakery's rent increased in January.

Answer: ______

Question 5

The town of Riverton banned single-use plastic bags in 2024. Since then, plastic litter in local parks has fallen by half. The mayor credits the ban.

Which of the following, if true, most strengthens the mayor's claim?

  1. A. Paper bag use has increased in Riverton.
  2. B. Plastic litter fell mostly near parks, not in areas where shoppers carry groceries.
  3. C. A neighboring town without a ban saw plastic litter fall by half as well.
  4. D. Most plastic litter in the parks was traced to single-use shopping bags.
  5. E. The town also started a park cleanup program in 2024.

Answer: ______

Question 6

Researchers found that cities with more public libraries have higher literacy rates. They conclude that libraries improve literacy.

Which of the following, if true, most strengthens the conclusion?

  1. A. Wealthier cities have both more libraries and higher literacy rates.
  2. B. Literacy rates rose in cities after new libraries opened, while staying flat elsewhere.
  3. C. Libraries are popular community gathering places.
  4. D. Some cities with few libraries have high literacy rates.
  5. E. Library funding comes mostly from local taxes.

Answer: ______

Question 7

A study of 500 office workers found that those with sit-stand desks reported 30 percent less back pain. The researchers conclude that sit-stand desks reduce back pain.

Which of the following, if true, most strengthens the conclusion?

  1. A. Sit-stand desks are more expensive than regular desks.
  2. B. The workers were randomly assigned to desk types, and the groups were otherwise similar.
  3. C. Back pain is common among office workers.
  4. D. Some workers preferred sitting all day.
  5. E. The study was funded by a desk manufacturer.

Answer: ______

Question 8

A farmer noticed that fields planted with clover between crops produced higher corn yields. She concludes that clover improves the soil for corn.

Which of the following, if true, most strengthens her conclusion?

  1. A. Clover is also used as animal feed.
  2. B. Fields with clover received the same rainfall and fertilizer as fields without it.
  3. C. The farmer has used clover for ten years.
  4. D. Corn prices rose this year.
  5. E. Clover is easy to plant.

Answer: ______

Question 9

A school added a daily 10-minute meditation session and saw detention rates fall 25 percent. The principal credits meditation.

Which of the following, if true, most strengthens the principal's claim?

  1. A. Meditation is popular in other schools too.
  2. B. A second school added meditation and saw a similar drop, while a third school that did not add it saw no change.
  3. C. Students say they enjoy the meditation sessions.
  4. D. Detention rates were already falling before the meditation started.
  5. E. The sessions take only ten minutes.

Answer: ______

Question 10

A city painted its crosswalks bright yellow and saw pedestrian accidents drop 15 percent. Officials credit the paint.

Which of the following, if true, most strengthens the officials' claim?

  1. A. Yellow paint costs more than white paint.
  2. B. Accidents fell only at the repainted crosswalks, not at crosswalks that kept white paint.
  3. C. Pedestrians like the color yellow.
  4. D. The city has many crosswalks.
  5. E. Drivers say they notice yellow crosswalks sooner.

Answer: ______

Answer Key

  1. 1. C — The improvement lines up exactly with where the lanes went in. That pattern is hard to explain any other way.
  2. 2. B — Random assignment kills the self-selection worry in A. If fiction reading itself raised scores, the causal claim holds up.
  3. 3. C — The gain is concentrated exactly where the change happened: lunch. That ties the menu to the money.
  4. 4. D — If customers say the organic flour is why they came, that directly ties the cause to the effect. A would weaken the claim instead.
  5. 5. D — If the litter that disappeared was the exact kind the ban targeted, the ban is the likely cause. E would weaken by offering an alternative.
  6. 6. B — A before-and-after comparison with a control group is the classic strengthener. It rules out the "wealth explains both" alternative in A.
  7. 7. B — Random assignment rules out the alternative that healthier people chose the fancy desks. That is what turns a correlation into evidence of cause.
  8. 8. B — Holding other factors equal isolates clover as the difference. Without that, rain or fertilizer could explain the yield gap.
  9. 9. B — Replication plus a comparison group is strong evidence. D would weaken the claim, and A, C, and E are irrelevant.
  10. 10. B — The drop happened exactly where the treatment was applied and nowhere else. That pattern points at the paint, not a citywide trend.

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