Ram Steel Co. typically achieves one of three production levels in any given year: 25 million pounds of steel, 18 million pounds of steel, or 12 million pounds of steel. In tracking some of its costs, Ram's controller discovered one cost that was $15 per pound at all production level. This is an example of a

A. fixed cost.

B. variable cost.

C. semivariable cost.

D. semifixed cost.