Recall the Application About the Shut-Down Price for Zinc to Answer

Recall the Application about the shut-down price for zinc to answer the following question(s) .
-Recall the Application.If the selling price of zinc falls below the shut-down price for one-quarter of the world's zinc mines,the output produced from these mines will

A) decrease by 25 percent.
B) still remain constant.
C) increase by 25 percent.
D) fall to zero.