The correct option is
C a heterocyclic compound, a monosaccharide and a phosphate group
The three chemically distinct components in a nucleotide are -
a heterocyclic compound, which is a nitrogenous base,
a monosaccharide, which is a pentose sugar, and
a phosphate group or phosphoric acid.
The heterocyclic compounds in a nucleotide are the nitrogenous bases named adenine, guanine, uracil, cytosine and thymine.
The pentose sugar is a five carbon monosaccharide. It may be a ribose sugar (in case of RNA) or a deoxyribose sugar (in case of DNA).