Answer:
D). lead to further questions.
Step-by-step explanation:
A good research question is characterized as the question that poses a problem before the researcher to be solved by gathering adequate evidence, comparison between probable answers, and then reaching the conclusion objectively.
As per the above detail, the most productive research question would be that 'lead to further questions' which the researcher needs to solve by gathering appropriate information and doing the necessary research to find evidence to provide solutions to these problems in specific light along with its related ideas together and solving the main problem or elaborating the topic. Thus, option D is the correct answer.