American Airlines is conducting a qualitative study on preferences of business travelers who fly frequently. Before inviting an individual to participate, the researcher on the project wants to ensure that all participants travel for business more than pleasure and meet the American Airlines' definition of frequent flier. What is the best way for the researcher to ensure that participants will meet these criteria?
A. Use a recruitment screener prior to inviting individuals to participate
B. Delete interviews after the study ends from those who don't meet the qualifications
C. Draw a sample from a list of people with an American Airlines affinity credit card
D. Draw a sample from a list of people with an affinity credit card associated with any airline
E. Contact a travel agency for a list of prospects
Answer: A. Use a recruitment screener prior to inviting individuals to participate