An argument concludes that a new product will be highly successful nationwide based solely on a pilot study conducted among employees of the company developing the product. What type of evidence would *most effectively* challenge the generalizability of this conclusion?

The correct answer to the question "An argument concludes that a new product will be highly successful nationwide based solely on a pilot study conducted among employees of the company developing the product. What type of evidence would *most effectively* challenge the generalizability of this conclusion?" is Option B: A survey of a diverse, representative sample of potential national consumers..

The other options — A) Data on the company's past product launches., C) Information about the manufacturing costs of the new product., D) Testimonials from the company's top executives. — are incorrect for this GMAT Exam Prep question. As explained above: The argument's weakness is its reliance on a biased, unrepresentative sample (employees). A diverse, representative sample of the target population (national consumers) is needed to assess national s…