Carbon in the One-Carbon Pool Can Be in the 5-Methyl-THF

Carbon in the one-carbon pool can be in the 5-methyl-THF form or the 5,10-methylene-THF form. Which statement is FALSE?

A) Both forms of carbon (methyl and methylene) can be used directly for thymidylate synthesis.
B) The methylene group of 5,10-methylene-THF can be oxidized to generate 5-methyl-THF and vice versa.
C) B₁₂ is a cofactor for utilization of the methyl group in the conversion of homocysteine to methionine.
D) More than one is false.