Sample Questions: Weaken
Pick the answer that most undermines the argument. Three original questions below. No timer. Check each answer and read the explanation before moving on.
A pharmaceutical ad claims its allergy pill works in 15 minutes, citing a trial where 80 percent of users reported relief within 15 minutes.
Which of the following, if true, most weakens the ad's claim?
If the placebo worked almost as well, the pill adds almost nothing. The 80 percent figure stops being evidence.
The principal argues that the new dress code reduced bullying, since reported bullying fell 30 percent after it took effect.
Which of the following, if true, most weakens the principal's argument?
A rival cause arrived at the same time. The drop could be the counselors and program, not the dress code.
A candidate claims the city's crime drop proves her policing plan worked, since crime fell 25 percent during her term.
Which of the following, if true, most weakens her claim?
A national trend explains the drop without her plan. If every city improved, her city's numbers prove nothing about her policy.
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Last updated October 12, 2026