What Would Be the Best Way for the Marketing Manager

Multiple Choice

What would be the best way for the marketing manager of a supermarket to find out how consumers move through the store?

A) Have an interviewer go through the store with each customer.
B) Observe customers with hidden cameras.
C) Give customers a questionnaire after they have finished shopping.
D) Install checkout counters at the end of each aisle.
E) None of these alternatives would be very good.