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 quantity of pollution could be achieved:

A) with a Pigouvian subsidy.
B) through a free market solution
C) with a Pigouvian tax.
D) by subsidizing consumers of the products produced by the firms.