Many social media platforms feature celebrities who make money by promoting various products. This is particularly common for the diet industry, which uses high-profile people to promote products. Which BEST explains why this is a problem?

A. These claims have been backed by scientific studies.

B. Celebrities tend to diet more than the ordinary people.

C. It is not since everybody knows it is really just advertising.

D. These celebrities do not give information about risks or side effects.