Carl Heads the In-House Market Research Department at Cook Champion

Carl heads the in-house market research department at Cook Champion Foods.He is planning a study that will help him understand the relationship between television commercials of a product and children's desire to buy the product after they have watched the commercial.Which of the following is the best way for Carl to define his research problem?

A) Determine how children are influenced
B) Understand child psychology
C) Understand the nature of television commercials
D) Determine the effect of television commercials
E) Determine the effect of television commercials on children