-The Above Figure Shows the Market for Steel Ingots

Multiple Choice

-The above figure shows the market for steel ingots.If the market is competitive,then to achieve the socially optimal level of pollution,the government can

A) institute a standard and allow firm to produce at most 50 ingots per period.
B) institute a standard and allow firm to produce at most 25 ingots per period.
C) institute a standard and allow firm to produce at most 100 ingots per period.
D) institute a standard and allow firm to produce at most 10 ingots per period.