Answer;
C) marginal cost
Step-by-step explanation;
-The marginal cost of production is the change in total cost that comes from making or producing one additional item. It is the cost of producing another unit of output as production volume changes. As production volume changes the price of producing each additional unit of output changes. Marginal cost measures that change. It is also called differential cost or incremental cost.
-Marginal cost is an important measurement because it accounts for increasing or decreasing costs of production, which allows a company to evaluate how much they actually pay to produce one more unit.