PSAT Reading Question 488: Answer and Explanation

Question: 488

Which option gives the best evidence for the answer to the previous question?

• A. Lines 11–15 ("Within . . . life")
• B. Lines 22–24 ("The purpose . . . stores")
• C. Lines 26–30 ("Thus . . . self-limited")
• D. Lines 30–32 ("As the . . . 'the crash' ")

Correct Answer: C

Explanation:

(C) The correct answer is choice (C) because this is the part of the passage that discusses how caffeine works. These lines talk about caffeine interacting with adenosine receptors that are intended to sense how much energy the body has expended. Choice (A) is wrong because it introduces the concept of adenosine triphosphate as a source of energy. Choice (B) merely suggests a purpose for sleep. Choice (D) is wrong because it talks about a time when caffeine doesn't work—when the body has simply expended too much energy and the body's adenosine levels have become too high.