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.What is the profit-maximizing price and output level?

A) $35 and 10 units
B) $50 and 15 units
C) $50 and 20 units
D) $20 and 20 units
E) $35 and 20 units