Which of the Following Represents a Difference in the Process

Which of the following represents a difference in the process by which a monopolistic competitor and a monopolist make their respective decisions about quantity and price?

A) only the monopolist competitor faces a downward-sloping demand curve
B) the monopolist's perceived demand curve is market demand
C) the monopolist competitor's perceived demand curve is market demand
D) a monopolist need not fear entry and also selection b above