Answer:
The answer to the question is Snowball Sampling
Explanation:
Snowball sampling is a primary data collection technique in which participants of a research process help to recruit other participants for a study or test. This kind of sampling is only used when it is hard to get potential participants to take part in a study or test. Why it is called snowball is because once a ball has been set rolling on a snowy day, it gathers snow as it rolls and becomes bigger.