If Entry into a Monopolistically Competitive Industry Occurs Because of Positive

If entry into a monopolistically competitive industry occurs because of positive profits earned by the existing firms,the

A) industry demand curve will shift to the left.
B) industry demand curve will shift to the right.
C) demand curve for each existing firm will shift to the left.
D) demand curve for each existing firm will shift to the right.
E) demand curves for the existing firms will remain unchanged.