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.What is the shut-down price for the zinc mines?

A) The cost of mining zinc varies from one mine to another; the shut-down price varies too.
B) The shut-down price is $1,900 per ton for all zinc mines.
C) The shut-down price is $1,500 per ton for all zinc mines.
D) none of the above