Which of the Following Statements Is True About Couponing

Which of the following statements is true about couponing?

A) Coupons offer price reductions only to those consumers who are price sensitive.
B) Coupons are often used by consumers who are already loyal to the brand.
C) Coupons for established brands or products are not redeemed.
D) Coupons are more effective than sampling for inducing initial product trial in a short period.
E) The redemption rate of coupons is very high.