Which of the Following Statements About Psychographics Is True

Which of the following statements about psychographics is true?

A) Psychographics was developed using only psychological and sociological factors.
B) Psychographics uses non-standard psychological scales.
C) Psychographics definitively explains purchase behaviours.
D) Psychographics was needed because the usual large-scale qualitative survey research yielded only a little information about a lot of people.