The manager of a food company wants to conduct a survey to find out whether consumers like or dislike a new brand of soup that was recently launched.

Which of the following data collection methods is mostly likely to get unbiased results?

• Ask the employees in the company which soup is the best.
• Ask customers who visit retailers within a 15 mile radius of the company headquarters.
• Ask distributors who supply the products to local retailers about the popularity of different soup brands.
• Ask customers who visit the grocery store nearest to the manager's house which soup they like the best.