Hi-Test Cola Company Wanted to Create a Sample That Would

Hi-Test Cola Company wanted to create a sample that would contain 25 of its regular cola drinkers, 25 of its diet cola drinkers, 25 of its diet caffeine-free drinkers, and 25 of its caffeine-free regular cola drinkers. The company did this by stopping people on the street and continuing until it had spoken to enough people to meet the requirement. Which sampling method was used?

A) non-probability convenience
B) non-probability quota
C) probability cluster
D) probability simple random