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 10.1

-If the price of the output produced by a perfectly competitive firm increases, then:

A) the marginal-cost curve will shift up.
B) the demand curve faced by the firm will shift to the left.
C) marginal cost will fall as output declines.
D) the marginal-revenue curve for the firm will shift up.
E) the marginal-cost curve for the firm will shift down.