In Long- Run Equilibrium,a Monopolistically Competitive Industry Is Characterized by

In long- run equilibrium,a monopolistically competitive industry is characterized by

A) all firms operating at the minimum point of their long- run average cost curves.
B) a perfectly elastic demand curve facing each firm in the industry.
C) positive profits for all firms in the industry.
D) zero profits for all firms in the industry.
E) positive profits as a result of barriers to entry.