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 $16,this firm will

A) produce four units in the short run and exit in the long run.
B) produce five units in the short run and exit in the long run.
C) produce five units in the short run and face competition from new market entrants in the long run.
D) shut down in the short run and exit in the long run.