Which statement below about nucleotides is true?
A. Base pairings occurs between adjacent nucleotides within a single strand of DNA.
B. A nucleotide is a polymer, for which the monomers are molecules of DNA.
C. In a nucleotide, the sugar is either deoxyribose (in DNA) or ribose (in RNA).
D. A nucleotide is composed of two sugars and a nitrogenous base.