How Do You Develop a Good Research Question

How do you develop a good research question?

A) You craft the question so that it conveys the focus of the study in an easy to understand sentence or two.
B) You define the scope or boundaries of the study and characterize the study as interdisciplinary.
C) You answer the "so what?" question.
D) All of the above are correct.
E) None of the above is correct.