Use the Following to Answer Question

Multiple Choice

Use the following to answer question:
Figure: Environmental Standards versus Emissions Taxes
-(Figure: Environmental Standards versus Emissions Taxes) In the figure Environmental Standards versus Emissions Taxes, if the goal is to limit the total emissions of the two firms, A and B, to 600 tons, the most efficient solution is an _____, and total pollution would be _____ tons.

A) environmental standard; 300
B) emissions tax; 600
C) environmental standard; 600
D) emissions tax; 200