单选题:What does Paragraph 3 mainly discuss?

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题目内容:
What does Paragraph 3 mainly discuss? A.Different effects of caffeinated coffee and decal on sleep.
B.Different findings of Lotan Shilo and a team about caffeine.
C.The fact that the subjects slept 415 minutes per night after drinking decaf.
D.The evidence that the subjects took half an hour to fall asleep.

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