Use the Table Below to Answer the Following Questions

Multiple Choice

Use the table below to answer the following questions.
Table 15.2.1
-Refer to Table 15.2.1.Given in the table are the marginal private cost and the marginal social cost of the production of chemical fertilizer and the marginal social benefit from the consumption of fertilizer.If the market is unregulated,the market price is

A) $10 a unit.
B) $20 a unit.
C) $30 a unit.
D) $40 a unit.
E) $50 a unit.