Answer: 3. decide whether to approve or disapprove research studies involving the use of human participants.
Explanation:
Under FDA regulations, an Institutional Review Board is a group convened with the authority to review and monitor biomedical research involving human beings as subjects.
The IRB has the authority to approve, require modifications in (to secure approval), or disapprove research and this serves a very important role in the rights and welfare protection of human research subjects.