other support for the research study findings. the way the research study was designed. when the research study was done. how the author feels about the research study.
I gave my students this multiple choice question: When considering if scientific research is correct, all of these are important except

Only one answer is correct among these 4 choices:
- other support for the research study findings.
- the way the research study was designed.
- when the research study was done.
- how the author feels about the research study.

Could you tell me which one is correct?

how the author feels about the research study.