Definition: You are given a question on high school microeconomics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following is a characteristic of monopolistic competition?
(A)Economically efficient in the long run. (B)Pricing at minimum ATC in long run. (C)Excess capacity. (D)Very few competitors.

C