Which of the following is true regarding the contribution margin ratio of a company that produces only a single product? Select one: O a. As fixed expenses decrease, the contribution margin ratio increases. O b. None of the given answer is correct. O O c. The contribution margin per unit multiplied by the selling price per unit equals the contribution margin ratio. O d. The contribution margin ratio equals the selling price per unit less the variable expense ratio. O e. The contribution margin ratio will decline as unit sales decline. If sales volume increases and all other factors remain constant, then the: 1 Select one: en O a. net operating income will decrease. b. break-even point will not change, o c. contribution margin ratio will increase. O d. None of the given answer is correct. e e margin of safety will decrease