Assume a monopolist does not practice price discrimination. Which of the following must be true for a monopolist at an output level where price (P) is equal to marginal cost (MC)?
A. the monopolist is maximizing profit
B. the monopolist is not maximizing profit and should increase output
C. the monopolist is not maximizing profit and should decrease output
D. the monopolist is earning a positive profit
E. None of the answer choices A?