The importance of sleep is often overlooked by students when they are preparing for exams. Research has consistently shown that sleep deprivation greatly reduces the ability to recall the material learnt. Hence, cutting down on sleep to study longer hours can be counterproductive. Which one of the following statements is the CORRECT inference from the above passage?
Options:
(A) Sleeping well alone is enough to prepare for an exam. Studying has lesser benefit.
(B) Students are efficient and are not wrong in thinking that sleep is a waste of time.
(C) If a student is extremely well prepared for an exam, he needs little or no sleep.
(D) To do well in an exam, adequate sleep must be part of the preparation.
Official Answer Key:
D
Step-by-Step Solution & Explanation
The passage states sleep deprivation reduces recall, so cutting sleep to study more is counterproductive — i.e., sleep is a necessary component of effective exam preparation, not a substitute for study (rules out A, which over-extends the claim) nor irrelevant (rules out B, C, which contradict the passage directly). Option (D) is the only statement that follows without over- or under-stating the passage's claim.
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