Suppose That an Industry Emits a Chemical That Pollutes the Ground

Multiple Choice

Suppose that an industry emits a chemical that pollutes the ground water. Without considering the effects of the pollution, the industry has a marginal private cost curve of MPC $= Q + 30$ . The market demand curve is $P = 60 - Q$ , while the marginal social cost curve is $\mathrm { MSC } = 2 \mathrm { Q } + 30$ . What is the socially optimal emissions standard?

A) 15 .
B) 10 .
C) 5 .
D) 0 .