Which of the following vitamins catalyzes one-carbon transfer reactions and requires THF as a coenzyme?

Question

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Folic acid (also known as vitamin B9) catalyzes one-carbon transfer reactions and requires tetrahydrofolate (THF) as a coenzyme. THF helps to transfer single-carbon units (in various oxidation states) between molecules in a process called methylation. Biotin (A) is involved in carboxylation reactions, thiamine (B) is involved in decarboxylation reactions, ascorbic acid (D) is a water-soluble antioxidant, and pantothenate (E) is involved in the synthesis of CoA. None of these vitamins are directly involved in one-carbon transfer reactions like folic acid is.

Which of the Following Vitamins Catalyzes One-Carbon Transfer Reactions and Requires