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 Shiloh and a team about caffeine.
C．The fact that the subjects slept 415 minutes per night after drinking decal.
D．The evidence that the subjects took half an hour to fall asleep.

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