Refer to the Following Paragraph to Answer the Questions Below

Multiple Choice

Refer to the following paragraph to answer the questions below.
Market researcher Shoko Yamamoto wants to test whether men like a new flavor of yogurt, which tastes like cigar smoke and beer, more than women. She has assistants go to four large grocery stores and distribute samples on each Saturday in April. In addition to distributing yogurt in white cups to anyone, the assistants give 50 samples in blue cups to adult males shopping alone and 50 samples in pink cups to adult females shopping alone. Afterwards, the assistants check nearby shelves and in a nearby garbage can to locate the used blue and pink cups. They measure whether more waste (i.e. uneaten yogurt) was left in blue or pink cups.
-What type of sampling was used in the study?

A) random
B) quota
C) stratified
D) snowball
E) cluster