You are conducting a study on illegal immigrants and employment history. You cannot post ads designed to elicit a sample due to the fear of the population regarding deportation if discovered. You know an illegal immigrant and have gained their trust. They agree to talk to you anonymously. After the interview, you ask the person to refer another immigrant to you to interview, also anonymously. After that interview, you ask for another referral from that participant, and so on. This method of obtaining a sample is known as
A. purposeful sampling.
B. quota sampling.
C. snowball sampling.
D. random sampling.
Answer: C
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