Which of the Following Statements Is Correct

Multiple Choice

Which of the following statements is correct?

A) Monopolies are guaranteed to earn an economic profit.
B) The market demand and the firm's demand are the same for a monopoly.
C) Monopolies have perfectly inelastic demand for the product sold.
D) Because a monopoly is the only firm in the market, its supply curve is the same as the market demand curve.
E) Because a monopoly is the only firm in the market, its marginal revenue curve must be the same as the market demand curve.