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?
✓ Correct Answer: Option B
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 success.