What does the experiment lnentioned in paragraph 4 prove？

What does the experiment lnentioned in paragraph 4 prove？查看材料

A.There are more enzymes in decaf drinkers" urine sample.

B.There are more melatonin concentrations in caffeine drinkers" urine sample.

C.Decaf drinkers produce less melatonin.

D.Caffeine drinkers produce less sleep hormone that decaf drinkers.

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