change the experiment. keep their opinions to themselves. find out what other scientists think about the results. repeat the experiment several times and compare results.
I gave my students this multiple choice question: Scientists who disagree with the results of an experiment should

Only one answer is correct among these 4 choices:
- change the experiment.
- keep their opinions to themselves.
- find out what other scientists think about the results.
- repeat the experiment several times and compare results.

Could you tell me which one is correct?

repeat the experiment several times and compare results.