Cost Volume Profit Analysis Is Based on Certain General Assumptions

Cost volume profit analysis is based on certain general assumptions. Which of the following statements about these assumptions is/are true?

A) The price of the product will remain constant as volume varies within the relevant range.
B) Expenses can be categorised as fixed, variable or semivariable.
C) Total fixed costs remain constant and unit variable cost remains unchanged as activity varies.
D) All of the given answers