Suppose the Figure Below Illustrates the Demand Curve Facing a Monopolist

Suppose the figure below illustrates the demand curve facing a monopolist. At a price of $8 per unit, the total revenue for this monopolist is ______ per day, and the marginal revenue earned from the last unit sold is ______.

A) $8; $8
B) $3,200; $8
C) $3,200; $4
D) $3,200; $0