Answer: A. Open-Ended question
Explanation: An open-ended question is one that requires one's opinion as an answer, so the answer can be anything or any opinion, which is why it's called an open-ended question. To such question, logically, answer there can not be "yes" or "no" because such a question requires explanation in response. This explanation may, in addition to thinking, be some knowledge in a particular field, but in any case, the respondent can always give a personal, therefore subjective opinion in response, while the question itself is objective. The question is objective because it does not indicate to anyone who gives an answer to do so in a direction that would be in line with an already established opinion or policy.