Suppose the Figure Below Shows the Demand Curve, Marginal Revenue

Suppose the figure below shows the demand curve, marginal revenue curve and marginal cost curve for a monopolist. At this monopolist's profit-maximizing level of output, its total revenue equals the area:

A) 0HNC.
B) 0FJB.
C) 0FLE.
D) ELJB.

MC = MR at F units of output, and from the demand curve we can see that at that level of output, the monopolist will charge a price of B. Total revenue equals price times quantity.