Question

Why do advertisers use testimonials?

A. They provide accurate, proven information to inform the consumer.
B. They provide hidden lies that will always misinform the consumer.
C. They provide celebrity encouragement to persuade the consumer.
D. They provide rebate money after purchases to refund the consumer.

Answer 1

I'd say the answer is A.  As a form of proof that the product does what it claims to do by providing evidence.