The correct option is D Ribonucleotides
A ribonucleotide or ribotide is a nucleotide containing D-ribose as its pentose component. It is considered as a molecular precursor of nucleic acids. Nucleotides are the basic building blocks of DNA and RNA. In living organisms, the most common bases for ribonucleotides are adenine, guanine, cytosine or uracil. The nitrogenous bases are classified into two parent compounds, purine and pyrimidine.