what is the answer?

Which of the following statements about operating leverage is false? C. a. The degree of operating leverage is higher for companies with lower fixed costs b. Keeping all factors constant, the higher the contribution margin, the higher the operating leverage. All of the given answers are true. d. Operating leverage measures how operating income will be affected by changes in sales e. If the degree of operating leverage higher for a company, this means that the company is more risky than another company with low degree of operating leverage