As a sales promotion tactic, why do marketers prefer using rebates?

Question $9$Select one:

a$.$

because customers often fail to redeem them

b$.$

because they are easy for the customer to use

c$.$

because they offer the customer a chance to actually try the product

d$.$

because they offer incentives that encourage satisfied customers to become repeat customers

e$.$

because they are most effective on everyday purchases