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

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

A) The number of units sold is the only revenue driver and the only cost driver.
B) Total costs can be separated into two components.
C) When represented graphically,the behaviors of total revenues and total costs are linear.
D) Selling price,variable cost per unit,and total fixed costs are known and constant.
E) The total costs are never separated into components in this analysis.