Suppose That an Instance of Market Failure Arises When a Monopoly

Suppose that an instance of market failure arises when a monopoly develops, and the monopoly charges a price higher than marginal cost. Which one of the following is TRUE?

A) The profit earned by the monopolist is a social benefit that will outweigh the cost of the market failure.
B) The appreciation consumers have from consuming the good will outweigh the cost of the market failure.
C) The price consumers pay for the good will exceed the opportunity cost to society of producing it.
D) A tax on the monopolist will eliminate the market failure, because she will cut back on the quantity produced.