Which of the Following Describes the Coenzyme Involved with Thymidylate

Multiple Choice

Which of the following describes the coenzyme involved with thymidylate synthase?

A) 5-methyl-THF serves as the methyl donor
B) 10-methyl-THF serves as the methyl donor
C) 5,10-methylene-THF serves as both methylene donor and reducing agent
D) 5,10-methenyl-THF serves as both methylene donor and reducing agent
E) S-adenosylmethionine serves as the methyl donor