The correct answer is C. Fellow of Royal Society.
The Royal Society is a learned society founded in 1660. It is the oldest scientific academy in the world. The society is a fellowship of distinguished scientists and engineers, and it is dedicated to promoting the advancement of science.
The title of Fellow of the Royal Society (FRS) is awarded to individuals who have made outstanding contributions to science. The FRS is one of the most prestigious scientific honors in the world.
The other options are incorrect. Federation of Regulation Society is not a real organization. Fellow Research System is not a real term. None of the above is the correct answer.