Critical Reasoning (CR) | Spokespersons for various brands of toothpaste, soap, etc. consumer go

Spokespersons for various brands of toothpaste, soap, etc. consumer goods, themselves do not regularly use the brands that they endorse. This may not only harm the marketing efforts of the company that owns the brands, it also indicates that the products are of inferior quality.

On which of the following inferences does the author of the passage base his conclusion that the products are of inferior quality?

A. Spokespersons endorse only those brands they use.
B. Quality(neither price, nor variety)