A nucleotide is

The nucleotide is a biomolecule that is the building block of nucleic acids.

It consists of a nitrogenous base, deoxyribose/ ribose sugar, and a phosphate group derived from phosphoric acid.

The combination of base and nucleotide without phosphate is called nucleoside.

The combination of base, nucleotide, and phosphate is called a nucleotide.

While the (base+sugar+ phosphate)n forms the nucleic acid.

The correct answer option is B, Base  +  Sugar  +  Phosphate.