If Firms in a Competitive Market Are Making Positive Economic

If firms in a competitive market are making positive economic profits,you would expect firms to:

A) enter the market, causing the demand curve to shift to the right.
B) enter the market, causing the demand curve to shift to the left.
C) enter the market, causing the market supply curve to shift to the right.
D) enter the market, causing the market supply curve to shift to the left.
E) leave the market, causing the market supply curve to shift to the left.