The correct option is B Nucleus
The internal volume of cell bounded by the plasma membrane is called as cytoplasm which in turn is composed of an aqueous solution, the cytosol, and a variety of suspended particles with specific functions, the organelles. The cytosol contains enzymes and the RNA molecules that encode them; monomers for macromolecules, metabolites, coenzymes etc. In eukaryotes, nucleus comprises of nuclear material enclosed within a double membrane, the nuclear envelope. It stores the genetic material in the form of DNA. RNA is synthesized during transcription in nucleus using DNA template strand and is transported to the cytoplasm to start protein synthesis. Option B is correct.