In Product-Mix Decisions,as Short-Run Changes in Product Mix Occur,the Costs

Multiple Choice

In product-mix decisions,as short-run changes in product mix occur,the costs that change:

A) are fixed with the number of units produced or sold.
B) are mixed with the number of units produced or sold.
C) vary with the number of units produced or sold.
D) are idle and they never change with the number of units produced and sold.
E) are not relevant because they are only short-run costs.