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: An industry with three firms selling a standardized or differentiated product would be called
(A)a competitive industry (B)a monopolistically competitive industry (C)an oligopoly (D)a duopoly

C