Which of the Following Is a Limitation of Focus Groups

Which of the following is a limitation of focus groups?

A) Not useful for answering questions like "how many?" and "how much?"
B) People sometimes try to answer questions the way they think would please the moderator or researcher-this is commonly known in research as demand effects
C) Are not ideal for sensitive topics.
D) Results cannot be generalized as only 6-12 people are used in a focus group.
E) All of the above are limitations of focus groups