Rebates and Refunds Are a Form of Consumer Promotion Where

Rebates and refunds are a form of consumer promotion where: 

A)  customers are offered regular trial sizes of the product either free or at a nominal price.
B)  additional amounts of the product are given to buyers when they purchase the product.
C)  prizes are available either through chance selection or games of skill.
D)  customers are given reimbursements for purchasing the product either on the spot or through the mail.