Answer: A.an institutional review board
Explanation: An institutional review board (IRB) looks at a research proposal from the ethical point when it involves human subjects. The IRB after the rights and welfare of human subjects involved in experiments such as in clinical trials. It ensures that the privacy and human rights of these people are not violated.
It also has the power to weigh the benefit of such a experiment against the risks and approve or shut down a research. It can also suggest changes to the research/experiment as it sees fit.