In the World Oil Market, Oil Is Supplied Up to the Point

Multiple Choice

In the world oil market, oil is supplied up to the point where

A) the marginal cost of the last barrel is just equal to the price buyers are willing to pay for that last barrel.
B) the marginal cost of the last barrel is zero.
C) the marginal cost of the last barrel is the greatest distance from the price buyers are willing to pay for that last barrel.
D) the marginal cost of the last barrel is at a maximum.