A Firm in a Competitive Market Has the Following Cost

A firm in a competitive market has the following cost structure: If the market price is $4,this firm will

A) produce 2 units in the short run and exit in the long run.
B) produce 3 units in the short run and exit in the long run.
C) produce 4 units in the short run and exit in the long run.
D) shut down in the short run and exit in the long run.