The Producer Surplus on a Unit of a Good Is

The producer surplus on a unit of a good is the

A) difference between the marginal social benefit and the marginal social cost.
B) number of dollars' worth of other goods and services forgone to produce this unit of the good.
C) difference between the price of the good and the marginal cost of producing the good.
D) difference between the total cost of the good and the marginal cost.