Which of the Following Statements About 3M's Market Research Prior

Which of the following statements about 3M's market research prior to introducing the Post-it^® Flag Highlighter is most accurate?

A) David Windorski worked with clay and wood models to see how much additional weight students would be willing to carry in their backpacks.
B) David Windorski asked students to dump the contents of their backpacks to make sure no clay prototype was being stolen.
C) David Windorski used focus groups, observed students' studying behavior, and even gave out trial Post-it^® Flag Highlighters to a sample of students to try for a month.
D) David Windorski hired students to act as "brand evangelists" to handout promotional samples of Post-it^® Flag Highlighters to other students at their respective universities and colleges during "move-in day."
E) David Windorski hired students as "mystery shoppers" to see what office supplies students bought at their college bookstores during the week before as well as the first week of classes.