Which of the Following Best Describes Snowball Sampling

Which of the following best describes snowball sampling?

A) A probability sampling technique in which names are drawn randomly from a sampling frame
B) A technique in which some participants are found in the population and they then lead the researcher to other participants in the population.
C) A convenience sample of individuals who are grouped together in one place.
D) A probability sampling technique in which the researcher first picks two members of the population, then four members of the population, then eight members of the population, and so on.