问题详情

What does Paragraph 3 mainly discuss？ 查看材料

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.

请帮忙给出正确答案和分析，谢谢！