Dave and Diya Play Two Games of Tennis Before Deciding

Multiple Choice

Dave and Diya play two games of tennis before deciding to stop for lunch. Using the concept of utility to explain their choices, we can conclude that:

A) the marginal utility of the second game must have been zero.
B) the marginal utility they would receive from playing a third game must be negative.
C) the marginal utility they would receive from playing a third game must be less than the marginal utility they would receive from eating lunch.
D) All of these are correct.