A Retail Margin Is the Difference Between ________ and ________

A retail margin is the difference between ________ and ________.

A) the volume of merchandise ordered; the volume of merchandise sold
B) the revenue generated by a retailer in a year; the taxes paid by a retailer in that same year
C) the retailer's operating expenses; the retailer's revenue
D) a product's retail selling price; a product's wholesale cost
E) a product's wholesale cost; a product's mark-up