Answer:
Nucleotides.
Step-by-step explanation:
Two types of nucleic acids are DNA and RNA. DNA is present as the genetic material in all the living organisms except some viruses. RNA is present as genetic material in some viruses only.
DNA is made of the polymers of nucleotides. The nucleotides consists of the nitrogenous bases (adenine, guanine, thymine and cytosine), deoxyribose pentose sugar and phosphate group. The RNA consists of oxyribose sugar and uracil instead of thymine.
Thus, the correct answer is option (d).