The Figure Given Below Shows the Revenue and Cost Curves

The figure given below shows the revenue and cost curves of a perfectly competitive firm. Figure 9.2
MC: Marginal cost curve
MR: Marginal revenue curve
ATC: Average-total-cost curve
AVC: Average-variable-cost curve
-Refer to Figure 9.2.If the marginal-revenue curve would have intersected the average-total-cost curve at its lowest point and the firm maximized profit,then total revenue would have been equal to:

A) $500.
B) $550.
C) $600.
D) $450.
E) $400.