What does the experiment mentioned in paragraph 4

What does the experiment mentioned in paragraph 4 prove?

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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