For Adrian, the marginal utility of the 5th energy drink in a day is positive and the marginal utility of the 6th energy drink in a day is zero. This
A. implies that Adrian maximizes utility by consuming 5 energy drinks per day.
B. implies that Adrian's demand curve for energy drinks per day will become upward sloping at 6 energy drinks per day.
C. is impossible because each additional unit of consumption of any good must provide positive marginal utility.
D. implies that at a zero price Adrian's demand curve will intersect the quantity axis at 6.
Answer: D
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