Which statement below best reflects the general rule regarding how many group interviews should be conducted for a given research project?
A. Conduct interviews until no new insight is gained
B. Use at least 3 groups for every geographic region involved
C. Include groups of men only, women only, and men and women combined
D. The more homogeneous the groups, the more groups are needed
E. All of the above are true
Answer: A. Conduct interviews until no new insight is gained