Use the Following to Answer Question

Multiple Choice

Use the following to answer question:
Figure: The Socially Optimal Quantity of Pollution
-(Figure: The Socially Optimal Quantity of Pollution) Use Figure: The Socially Optimal Quantity of Pollution.In the figure,firms are the only beneficiaries of pollution,and costs are borne solely by others in the society.The optimal level of pollution is:

A) zero since no pollution is best for society.
B) where the marginal social benefit curve intersects the quantity axis.
C) where the marginal social cost curve intersects the quantity axis.
D) where the marginal social benefit curve intersects the marginal social cost curve.