Answer: D. The purpose of the project
Explanation:Research is something which aims to enhance not merely the knowledge of the students but to enrich their thoughts too. Thus, while choosing a research topic it is very important to consider the purpose behind the project in mind yet at the same time the interest level of the students is also very important as the research should nurture their future path. A research topic should not be something "out of the box" like thing rather it has to be related to their field as it would help the researcher to prosper in their interest and specialized field. Another important point is that the idea has to be feasible and contains a visionary approach.