Dave and Buster play two games of tennis, and then decide to go have lunch. Using the concept of utility to explain their choices, we can conclude that:
A. the marginal utility from playing a third game must be less than the marginal utility from having lunch.
B. the marginal utility from playing a third game must be negative for them.
C. they each won one game of tennis.
D. All of these must be true.
Answer: A
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