Question

if a nucleotide has a hydroxyl group on the 2 carbon of its sugar, it: could be any nucleotide. must be a ribonucleotide. must be a deoxyribonucleotide.

Explanation:

Ribonucleotides have a hydroxyl group (-OH) on the 2' - carbon of their ribose sugar. Deoxyribonucleotides lack this -OH group at the 2' - carbon (instead have a hydrogen atom). So a nucleotide with a hydroxyl group on 2' - carbon of its sugar must be a ribonucleotide.

Answer:

must be a ribonucleotide.