One of the don'ts of questionnaire construction is to ensure that fixed responses do not overlap. Which of the following is the best illustration of a problem that this "don't" might cause?
a. A question has three possible responses: yes, no, or maybe.
b. An income question asks for an income designation in one of the following income categories: $0-$20,000, $20,000-$40,000, or $40,000 and above.
c. A consumer is asked to describe a recent event while driving.
d. A consumer must describe a cartoon about buying a car.
e. A consumer is asked whether or not he or she could spy on another consumer's shopping experience.
Answer: b