When one is engaged in human subject research and needs to select subjects, A. Participants should be chosen so the burdens and benefits of the research are shared equitably.
There should be as little bias as possible in research which means that in human subject research, the subjects chosen should be as equal as possible.
For this reason, participants which are chosen need to be chosen such that they share in whatever burdens and benefits the research has, equally.
In conclusion, option A is correct.
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