If Firms in a Monopolistically Competitive Industry Are Earning Economic

If firms in a monopolistically competitive industry are earning economic profits, then in the long run

A) the government will probably regulate firms in this industry to reduce these economic profits.
B) new firms producing exactly the same product will enter the industry and this entry will continue until economic profits are eliminated.
C) these firms can continue earning economic profits since entry into the industry is blocked.
D) new firms producing close substitutes will enter the industry and this entry will continue until economic profits are eliminated.