Which One of the Following Statements About the Importance of a Research

Which one of the following statements about the importance of a research problem being studied is correct?

A) A research problem is important if its importance is explained well in the research report.
B) A research problem is important if the study is conducted in a scientifically rigorous way.
C) A methodologically weak study can make an important contribution if the problem is important.
D) A methodologically strong study makes an important contribution even if the research problem is trivial.