Use the Figure to Answer the Following Question(s)

Use the figure to answer the following question(s) .
Figure 9-4

At the market price of $6 in Figure 9-4, indicate the firm's total revenue and total cost at its profit-maximizing level of output.

A) total revenue, $30 million; total cost, $22.5 million (approx.)
B) total revenue, $30 million; total cost, $30 million
C) total revenue, $40 million; total cost, $30 million
D) total revenue, $48 million; total cost, $38 million (approx.)