Final answer:
The Research Ethics Board (REB) determines whether the benefits of a proposed study outweigh its potential risks.
Step-by-step explanation:
The Research Ethics Board (REB) is the group that determines whether the benefits of a proposed study outweigh its potential risks. The REB reviews proposals for research that involves human participants and ensures that the experiment does not result in harm. Approval from the REB is required for the experiment to proceed.