An Environmental Economic Consulting Firm Is Hired to Measure the Negative

An environmental economic consulting firm is hired to measure the negative externalities associated with the pollution from an industry.The consultants calculate the marginal social cost of production to be MSC = 2Q+30 and the marginal private cost of production to be +30.The market demand curve for the industry can be expressed as P = 60-Q.If the industry currently does not take into account the negative externality in its supply decisions,the industry is ________________ by _____________ units relative to the social optimum.

A) under-producing; 5
B) over-producing; 5
C) under-producing; 8
D) over-producing; 8