A Disadvantage of Mall Intercept Interviews Is

A disadvantage of mall intercept interviews is

A) their difficulty in finding qualified interviewers to work at relatively low salaries.
B) their lack of reliability due to changes in customer traffic during holidays.
C) they create ill will with shoppers who are in hurry or looking for a relaxing mall experience.
D) the people selected may not be representative of the targeted consumers.
E) people only participate if they think they will receive something in return, so their answers are often biased.