GMAT Critical Reasoning (CR) | In a survey of 100 pet owners, 80 percent said that they would

In a survey of 100 pet owners, 80 percent said that they would buy a more expensive pet food if it contained vitamin supplements. Consequently, CatCo’s new premium cat food should be a top-seller.

Which of the following best demonstrates a weakness in the author’s conclusion?

(A) Some brands of cat food contain more vitamin supplements than CatCo’s does.
(B) CatCo sells more cat food than any of its competitors.
(C) Some of the cat owners surveyed stated that they never buy expensive brands
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