If a competitive firm has a U-shaped marginal cost curve then

A) the profit maximizing output will always generate positive economic profit.
B) the profit maximizing output will always generate positive producer surplus.
C) the profit maximizing output is found where MC = MR and MC is decreasing.
D) the profit maximizing output is found where MC = MR and MC is constant.
E) the profit maximizing output is found where MC = MR and MC is increasing.

E