The telephone company wants to survey its 100,000 customers. Four proposals for sampling the customers are being considered. Which would you recommend?

• A. interview every 75th person listed in the telephone directory
• B. mail a questionnaire to all 100,000 customers and assume at least 1200 will respond
• C. interview the people in every 50th residence from a postal listing of all addresses
• D. interview those 1000 persons with the highest phone bills