Why Don't the Majority of Customers Bother to Redeem Rebates

Why don't the majority of customers bother to redeem rebates?

A) The discount offered by rebates is not significant enough.
B) The procedure to redeem a rebate is complex as well as lengthy.
C) The price cut is not offered directly to the consumers.
D) The price on the shelf is more than the normal price of the product.
E) The rebates come with riders such as a minimum purchase.