The correct option is B Ribosomal RNA
The spherical body present inside the nucleus of a eukaryotic cell is called the nucleolus. The nucleolus is the site where rRNA is synthesized. Ribosomal proteins are translated by the ribosomes from mRNA outside the nucleus. These are then carried to the nucleolus for the assembly of ribosome subunits in the nucleolus. Thus, the correct answer is option D.