The Optimal Quantity of Pollution Is

The optimal quantity of pollution is:

A) zero.
B) the level that allows for maximum economic growth.
C) the level where the marginal cost of pollution abatement exceeds the marginal benefit of pollution abatement by the greatest amount.
D) the level where the marginal benefit of pollution abatement exceeds the marginal cost of pollution abatement by the greatest amount.
E) none of the above.