When a Monopolistically Competitive Industry Is in Long- Run Equilibrium

When a monopolistically competitive industry is in long- run equilibrium, each firm will be operating where price is

A) equal to average total cost and to marginal cost.
B) greater than marginal cost but equal to average total cost.
C) greater than average total cost and greater than marginal cost.
D) greater than average total cost but equal to marginal cost.
E) less than marginal cost and equal to average total cost.