Answer:
What factors caused the civil war?
Step-by-step explanation:
A question can be defined as a statement that begs or requires an answer, response or reply.
Generally, there are three (3) main types of question and these includes;
I. Rhetorical question: this is a question that expresses a person's opinion but do not require an answer, reply or response.
II. Open-ended question: this type of question requires the respondent to give a detailed explanation rather than just a yes or no response.
III. Between the lines: it involves discovering an answer that is implied but not stated explicitly. Thus, the answer is hidden in the piece of information provided.
Hence, the best example of an open-ended research question is, "What factors caused the civil war?" because several answers and a well-detailed explanation would be given by the respondent.