Which method of sampling relies on the assumption that rare groups of people tend to form their own unique social circles?

Which method of sampling relies on the assumption that rare groups of people tend to form their own unique social circles?

Which method of sampling relies on the assumption that rare groups of people tend to form their own unique social circles? 









A. Judgment sampling

B. Quota sampling

C. Cluster sampling

D. Snowball sampling

E. Convenience sampling










Answer: D