Use the Following Figure to Answer the Question : Figure

Multiple Choice

Use the following figure to answer the question : Figure 9-3 : shows the marginal cost curve,average total cost curve,average variable cost curve,and marginal revenue curve for a firm for different levels of output.
-Refer to Figure 9-3.At the profit-maximizing level of output:

A) the firm is earning economic profit.
B) profits per unit are the highest.
C) profit equals ZC.
D) costs exceed revenue.