What does paragraph 3 mainly talk about？查看材料A.Diff

What does paragraph 3 mainly talk about？查看材料

A.Different effects of caffeinated coffee and decaf on sleep.

B.Different findings of Lotan Shilo and ateam about caffeine.

C.The fact that the subjects slept 415 tninutes per night after drinking decaf.

D.The proof that the subjects took half an hour to fall asleep.

请帮忙给出正确答案和分析，谢谢！

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What does paragraph 3 mainly talk about？ 查看材料A.Diff