Which of the Following Is a Valid Criticism of Unregulated

Which of the following is a valid criticism of unregulated monopoly?

A) Monopoly limits the options available to consumers.
B) Relative to a competitive market, a monopolist generally will produce too great an output.
C) Profit-maximizing monopolists will fail to produce at the lowest possible cost.
D) A monopoly's output will often be more than if the market were competitive.