In the Long Run, a Monopolistically Competitive Firm Will Find

In the long run, a monopolistically competitive firm will find

A) its demand curve shifting until price equals average total cost
B) its cost curve shifting until price equals average total cost
C) its demand curve shifting until marginal revenue equals marginal cost
D) its cost curve shifting until marginal revenue equals marginal cost
E) no changes in its demand or cost curves if it is earning an economic profit