Sample Questions: Strengthen
Pick the answer that makes the argument stronger. Three original questions below. No timer. Check each answer and read the explanation before moving on.
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?
The improvement lines up exactly with where the lanes went in. That pattern is hard to explain any other way.
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?
Random assignment kills the self-selection worry in A. If fiction reading itself raised scores, the causal claim holds up.
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?
The gain is concentrated exactly where the change happened: lunch. That ties the menu to the money.
A free diagnostic shows your starting score, then a study plan tells you what to work on next.
Last updated October 12, 2026