An ice cream store wants to use a survey to determine which newspapers its customers regularly read. Which of the following procedures would be most appropriate for obtaining a statistically unbiased sample?

A. Survey a randomly selected sample of people living in the city's limits.

B. Survey the first 100 customers on an alphabetical listing of all the ice cream store's customers.

C. Survey 100 customers whose names are randomly chosen from an alphabetical listing of all customers of the ice cream store.

D. Survey 100 people whose names are randomly chosen from the local telephone directory.