-In the Above Figure,if a Firm Is Cleaning Up $\mathrm { Q } _ { 4 }$

-In the above figure,if a firm is cleaning up $\mathrm { Q } _ { 4 }$ units of pollution,it is an

A) efficient solution,because marginal social benefits are greater than marginal social costs.
B) efficient solution,because marginal social benefits are equal to marginal social costs.
C) inefficient solution,because marginal social benefits are greater than marginal social costs.
D) inefficient solution,because marginal social costs are greater than marginal social benefits.