The Following Figure Shows the Costs and Revenue Curves of a Firm

The following figure shows the costs and revenue curves of a firm in a monopoly market.

-Refer to the figure above.If the government decides to regulate this market,the best strategy would be to ________.

A) set the price at $3
B) set the price at $2
C) levy a $2 tax on the monopolist
D) levy a $1 tax on the monopolist