Could you help me in solving this question, Doctor, as soon as possible, please, and thank you.

Question The variable cost ratio is calculated as: 16 O a. The selling price per unit / variable cost per unit Not yet answered O b. The selling price per unit ratio / variable cost per unit ratio Marked out of O c. None of the given answers 0.60 O d. (the selling price per unit/the selling price per unit) - contribution margin ratio Flag question O e. Selling price per unit - the variable cost per unit