While drinking coffee, you believe that the marginal benefit of drinking one more cup is greater than the marginal cost of that cup. You then conclude that:
A. you will be better off if you drink one more cup.
B. you will be no better off and no worse off from drinking one more cup.
C. you will be worse off if you drink one more cup.
D. the total cost of drinking the coffee will be more than the total benefit of drinking the coffee.