If a Firm in a Perfectly Competitive Market Faces the Curves

If a firm in a perfectly competitive market faces the curves in the graph shown and observes a market price of $16,the firm:

A) can make positive profits by producing less than 43 units.
B) can make positive profits by producing where MC = MR.
C) cannot make positive profits and should shut down in the short run.
D) should continue to operate in the short run, but plan to exit in the long run.