Which of the Following Pertains to the Creation of a Perceptual

Which of the following pertains to the creation of a perceptual map?

A) Retailers focus on database development through optical scanning at the point of purchase.
B) Marketers have to work on branding of both new and existing products.
C) Marketing research considers the total performance of a promotional program as each effort often affects others in the promotional mix.
D) Consumers have to indicate how similar or dissimilar a group of relevant brands or products is to each other.
E) Consumer behavior activities embedded in a cultural context are studied by marketers using ethnographic research.