32What does Paragraph 3 mainly discuss？ 查看材料A.Differe1973

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！