An un-regulated paint factory that pollutes a river results in ______ and _____.
A. Over-production; a price that exceeds the marginal benefit of the good.
B. Under-production; a price that equals the marginal benefit of the good.
C. The efficient quantity produced; a marginal benefit equal to the marginal social cost.
D. An inefficient quantity produced; a marginal benefit below the marginal social cost.