The Following Figure Shows the Revenue Curves of a Monopolist

The following figure shows the revenue curves of a monopolist: Figure 10.6 D: Average revenue
MR: Marginal revenue
In Figure 10.6, assume that marginal costs are constant at $2, 500 and fixed costs are zero.What price and output level would result from perfect competition?

A) P = $2, 500, Q = 400
B) P = $2, 500, Q = 200
C) P = $5, 000, Q = 0
D) P = $4, 000, Q = 400
E) P = $4, 000, Q = 200