Which One of the Following Was NOT Mentioned in the Textbook

Which one of the following was NOT mentioned in the textbook as an advantage of focus groups?

A) They generate fresh ideas.
B) They allow hidden cameras to record hidden motives.
C) They allow clients to observe the group.
D) They are generally versatile in that they can handle an unlimited number of topics.
E) They allow access to special respondent groups such as lawyers or doctors.