The Following Figure Shows the Revenue and Cost Curves of a Monopolist

The following figure shows the revenue and cost curves of a monopolist. Figure 24.3 D: Average Revenue
MR: Marginal Revenue
ATC: Average Total Cost
MC: marginal Cost
Consider the monopolist described in the Figure 24.3.If the firm engages in profit-maximizing behavior, economic profit per unit of output will be:

A) 0
B) P₂
C) P₄ minus P₂
D) P₅ minus P₄
E) P₅ minus P₁