Which of the Following Forms of Tetrahydrofolate Is Correctly Paired $\rarr$

Multiple Choice

Which of the following forms of tetrahydrofolate is correctly paired with the reaction for which it serves as a coenzyme?

A) 5,10-methenyl-THF: biosynthesis of purines
B) 5-methyl-THF: dUMP $\rarr$ dTMP
C) 5,10-methylene-THF: glycine $\rarr$ serine
D) 5-methyl-THF: methionine $\rarr$ homocysteine
E) all of the above