When a Marketing Researcher Wants to Interview Teenagers Between the Ages

Multiple Choice

When a marketing researcher wants to interview teenagers between the ages of 16 -19
About what types of music they prefer,and asks the researchers to go to a shopping mall and ask teenagers if they own at least 100 music CDs in order to select her interview sample,and then asks shoppers who qualify for this screening question to suggest the names of two of their male friends who own at least 100 music CDs to see if they want to participate in the study as well,what type of sampling procedure is being used?

A) Snowball sample
B) Multi-stage area sample
C) Area sample
D) Systematic sample
E) Judgment sample