Sleep improves memory. Students who napped after class recalled more than those who did not. Strengthen?
ANap room was quiet.
BBoth groups had identical pre-test scores.
CStudents chose the nap voluntarily.
DClass was in the morning.
Answer & Solution
Correct answer: B. Both groups had identical pre-test scores.
1. Equal baselines rule out prior ability as cause. 2. Strengthens link nap → recall.
_Source: 501-GMAT-Questions Ch 2 Critical Reasoning_
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