Answer:A) a DNA nucleotide
Explanation: Nucleotides are the building blocks of nucleic acids. RNA and DNA are the two types of nucleic acids. An RNA has a ribose sugar, hence the name ribonucleic acid but a DNA has a deoxyribose sugar hence the name deoxyribonucleic acid. A DNA nucleotide is made of three molecules, a deoxyribose sugar, a nitrogenous base and a phosphate group. The nitrogenous bases found in DNA are Adenine, Thymine, Cytosine and Guanine. An RNA nucleotide is made up of three molecules, a ribose sugar, a nitrogenous base and a phosphate group. The nitrogenous bases found in RNA are Adenine, Uracil, Guanine and Cytosine.