Nona Has Just Gone on a Bike Ride for an Hour

Multiple Choice

Nona has just gone on a bike ride for an hour and says it gave her a utility of 7.If she chooses to continue to ride her bike for another hour:

A) we can assume she will get at least a marginal utility of more than 7.
B) we can assume she will get a marginal utility of 7.
C) we can assume she will get a marginal utility of less than 7.
D) we can assume Nona's total utility will fall because of diminishing marginal utility.