Which of the following is an example of an unstructured question?
A. "Would you buy this product (Yes/No)?"
B. "Would you buy this product (A. definitely, B. maybe, C. definitely not)?"
C. "What would convince you to buy this product (A. lower price, B. larger packaging, C. better taste)?"
D. "Please rate the attributes of this product that are important to you (rate 1-5, with 1 being most important and 5 being least important).
E. "Why did you buy this product?"
Answer: E. "Why did you buy this product?"