Which of the following is an example of an open-ended question? a. what did you like about your summer vacation? b. did you have fun on your summer vacation? c. what movies did you see over your summer vacation? d. where did you spend your summer vacation?

A., B., and D. are all open-ended questions. Open-ended questions require a more that one word answer. I think the question you are asking is, Which of the following is an example of a closed-ended question? If it is, the answer would be B.Did you have fun on your summer vacation? because it can be answered with yes or no.