Which of the Following Is Not an Assumption of Cost-Volume-Profit

Multiple Choice

Which of the following is not an assumption of cost-volume-profit analysis?

A) The variable cost per unit varies over the relevant range of activity.
B) The sales mix is unchanged over the relevant range of activity.
C) The total fixed cost is constant over the relevant range of activity.
D) The total variable cost changes in direct proportion to changes in the level of activity over the relevant range of activity.