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Which of the following is true regarding the contribution margin of a company that produces only a single product? Select one: O a. The contribution margin per unit equals the selling price per unit less the variable expense per unit O b. As fixed expenses decrease, the contribution margin ratio increases. Oc None of the given answer is correct. d. The contribution margin ratio will decline as unit sales decline. e. The contribution margin per unit multiplied by the selling price per unit equals the contribution margin ratio. If sales volume increases and all other factors remain constant, then the: Select one: O a. None of the given answer is correct. O b. contribution margin ratio will increase c.net operating income will decrease. Od break-even point will decrease. e margin of safety will decrease