IMO DThe conclusion drawn in the argument is that CatCo's new premium cat food, which presumably contains vitamin supplements, should be a top-seller. This conclusion is based on the premise from a survey that 80% of pet owners would buy more expensive pet food if it contained vitamin supplements.
To find the best option that demonstrates a weakness in the author's conclusion, we need to identify an answer that undermines the assumption that the survey results apply directly to CatCo's cat food sales.
(A) Some brands of cat food contain more vitamin supplements than CatCo’s does.
This choice suggests that CatCo’s new premium cat food might not be as competitive in terms of vitamin supplement content. However, it does not directly weaken the conclusion about the potential top-selling status based solely on the presence of vitamin supplements.
(B) CatCo sells more cat food than any of its competitors.
This information could actually support the conclusion rather than weaken it, as a leading market position might enhance sales potential.
(C) Some of the cat owners surveyed stated that they never buy expensive brands of cat food.
While relevant, this only indicates a preference against expensive brands among some cat owners, not necessarily a significant enough factor to dispute the conclusion about the new product's potential success.
(D) Ninety-five of those pet owners surveyed did not own cats.
This choice significantly weakens the conclusion because it challenges the relevance of the survey data to CatCo’s target market. If most surveyed pet owners do not own cats, their preferences might not reflect the purchasing behaviors of cat owners specifically.
(E) Many veterinarians have stated that vitamin supplements in cat food do not greatly increase health benefits.
This choice undermines the perceived value of vitamin supplements in cat food but does not directly address whether cat owners (regardless of the actual benefit) would buy such products as indicated by the survey.
Among these options, (D) best demonstrates a weakness in the author's conclusion because if the majority of the surveyed individuals are not cat owners, their preferences about pet food are less likely to be indicative of the market behavior of cat owners, who are the actual target customers for CatCo’s new cat food. Hence, the survey results may not accurately predict the sales success of the new cat food among cat owners