The correct option is C 50S
Ribosomes are naked ribonucleoprotein particles found in both prokaryotic and eukaryotic cells. Ribosomes are the cell organelles which carry out protein synthesis during the process of translation. The prokaryotes have 70S type of ribosomes while eukaryotes have 80S type of ribosomes. Prokaryotic ribosomes are made up of a large subunit (50S) and a smaller subunit (30S) while eukaryotic ribosomes are made up of 60S and 40S subunits.