An Advantage of Coupons as a Sales Promotional Tool Is

An advantage of coupons as a sales promotional tool is that

A) it makes it possible to give a discount to a price-sensitive consumer while still selling the product at full price to other consumers.
B) a coupon-redeeming consumer is often a competitive brand user, so the coupon can induce brand switching.
C) in-package coupons can induce repeat purchases.
D) all of these are advantages of coupons as a sales promotional tool.