If Bella Eats One Piece of Pie, She Receives a Utility

Multiple Choice

If Bella eats one piece of pie, she receives a utility of 10. If she continues eating, a second piece of pie will yield a marginal utility of 8, a third will yield a marginal utility of 2, and a fourth will yield a marginal utility of -2. Which of the following statements is true?

A) Bella's marginal utility is not diminishing.
B) Bella's total utility will decrease if she eats a third piece of pie.
C) Bella's total utility will be maximized if she eats three pieces of pie.
D) Bella's total utility decreases after the first piece of pie.