Which One of the Following Is NOT an Example of a Seller

Multiple Choice

Which one of the following is NOT an example of a seller offering signals of quality?

A) Chau asks customers to write reviews of her manicures on a website for local businesses.
B) Hui Er proofreads her job application and cover letter four times to make sure it shows that she is careful about details.
C) Mak offers a money-back guarantee on his product.
D) Ian's Auto Body Shop offers a warranty on its work.