Answer: Which of the following is the most frequent error made by graduate students in formulating statements of the research problem is:
D. Selecting a problem that is too broad.
Explanation: Most graduate students in formulating statements of the research problem they select a problem that is too broad because they are just finishing from the university and they don't really know how to effectively streamline the problem statement of their research. This inexperience end up making them have more cost while embarking on the research.