Today, Firms in a Perfectly Competitive Market Are Making an Economic

Today, firms in a perfectly competitive market are making an economic profit. In the long run, firms will ________ the market until all firms in the market are ________.

A) exit; covering only their total fixed costs
B) enter; making zero economic profit
C) exit; producing at the minimum point on their long-run average cost curve
D) enter; making zero normal profit