如果强大的竞争对手实行的是无差异市场营销，企业则应实行（）营销。

A firm realizes that it is producing more than the profit maximizing level of output and makes a short-run decision to decrease its output. Which of the firm's cost measures is least likely to decrease as a result（）

A. Average variable cost.

B. Average total cost.

C. Average fixed cost.