在Windows提供的“计算器”进行复杂函数、统计运算时，应在“查看”菜单中把计算器设置为。

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.