Suppose an Advertising Researcher Needs to Know What Hunters Think

Suppose an advertising researcher needs to know what hunters think about an ad campaign for Zeiss rifle scope that had been designed specifically for hunting in heavy bush and demanding terrain.The entire target population for the marketing research is:

A) determined by a reliability quotient.
B) called the focus group.
C) called the sample.
D) called the universe.
E) determined by a validity quotient.