The Idea Underlying the Mass-Merchandising Concept Is That

The idea underlying the mass-merchandising concept is that:

A) A big profit on each item sold won't earn much if sales volume is low.
B) Inventory is a big cost, so everything you stock should be out on a shelf where it can be seen by the mass market.
C) A retailer must "buy low and sell high" if it's going to make an attractive profit.
D) It is better to sell more at the same price--since total revenue will increase.
E) All of the above are true.