In Monopolistic Competition,firms Making Substantial Profits Tend to Be Emulated,this

Multiple Choice

In monopolistic competition,firms making substantial profits tend to be emulated,this shrinks the once substantial profits,because when _____,there are no profits.

A) Marginal revenue equals average revenue
B) Average total cost equals average fixed cost
C) Average revenue equals marginal cost
D) Marginal revenue equals average total cost
E) Average revenue equals average total cost