Each Firm in a Perfectly Competitive Industry

Each firm in a perfectly competitive industry

A) produces a good that is slightly different from that of the other firms.
B) has an important influence on the market price of the good or service being produced.
C) attains economies of scale so that its efficient size is large compared to the market as a whole.
D) produces a good that is identical to that of the other firms.
E) has control over at least one unique resource to separate itself from its competitors.