Sadie Has Just Eaten a Donut and Received a Utility

Multiple Choice

Sadie has just eaten a donut and received a utility of 6.If she chooses to eat another donut:

A) we can assume she will get at least a utility of 6.
B) we can assume she will get a utility of 6.
C) we can assume she will get less than a utility of 6.
D) we can assume Sadie's total utility will fall because of diminishing marginal utility.