Use the Following to Answer Questions

Use the following to answer questions
Jack Watson, an MBA student at the University of Tasmania in Hobart, recently purchased a small ice-cream and frozen yoghurt business close to campus to help pay his way through the program.Even though Hobart has cold winters, ice-cream and frozen yoghurt generally sell well year-round.After two months of operation, it became clear why the previous owners had sold the business: even though it seemed to be ideally located, sales were extremely disappointing.
-Before administering the questionnaire, Jack spoke to other ice-cream retailers and learned that, although young families make up a small percentage of the city's population, they purchase large amounts of ice-cream.In light of this, Jack decided to include a minimum of 25 per cent young families in his sample.The final choice of respondents was left up to the interviewers.This sampling method is known as __________ sampling.

A) quota
B) stratified
C) random
D) representative
E) area