At Revolution Doughnuts in Fort Collins, Colorado, a cup of coffee or a doughnut is $1. Suppose Hannah loves going to Revolution Doughnuts. She spends $5 a day at the shop on 3 doughnuts and 2 cups of coffee. Is Hannah maximizing her total utility?
选项：

A: No
B: Maybe, but I need to know more about Hannah's income
C: Yes
D: Maybe, but I need to know more about Hannah's marginal utility per dollar for each of the two goods