22. In a monopolistically competitive industry, if the typical firm is earning economic profits in the short run, profits....

A) May continue to exist in the long run, since there are substantial entry barriers.

B) Will tend to be eliminated, as additional firms enter the industry selling identical products.

C) Continue to exist in the long run, since each firm sells a slightly different product.

D) Will tend to be eliminated in the long run, as additional firms enter the industry selling somewhat differentiated products.