A researcher developing a questionnaire becomes aware of an interesting additional relationship that could be investigated at very little cost and effort. He knows that this is not vital to his present research purpose. He should

Forget it

Explanation:

The researcher developing questionnaire is not vital to his research purpose then he should forget about it and channel his energy towards vital things for his research.

do your own work

you really need to do your own work and stop cheating

answer; dishonor to his country,polyneices was a traitor;