plz solve q 23 fastly

Question 23 Which of the following statements about CVP analysis is false? Not yet answered Marked out of 0.60 P Flag question O a Operating income calculations in CVP analysis are based on contribution margin not gross margin. b. All of the given answers are true. OC. Unit selling price, unit variable costs, and total fixed costs are known and remain constant. od. Total revenues and total costs are linear in relation to output units. e. The CVP analysis assumes that total variable costs remain the same over a relevant range