A Perfectly Competitive Firm Incurs Loss in the Short Run

A perfectly competitive firm incurs loss in the short run if at the profit maximizing level of output:

A) the marginal revenue curve lies below the marginal cost curve.
B) the marginal revenue curve lies above the average revenue curve.
C) the average cost curve lies below the average revenue curve.
D) the average revenue curve lies below the average cost curve.
E) marginal revenue curve lies above the marginal cost curve.