Use the Following to Answer Question

Use the following to answer question:
Figure 17.7
-(Figure 17.7) Which of the following statements is TRUE?

A) The efficient quantity of pollution occurs at or below 6,000 units.
B) At 2,000 units of pollution, the marginal benefit is less than the marginal cost, so there should be less pollution.
C) At 2,000 units of pollution, the marginal benefit exceeds the marginal cost, so there should be more pollution.
D) At 2,000 units of pollution, the marginal benefit exceeds the marginal cost, so there should be less pollution.