Quantitatively, the Major Metabolic Fate of Glycine in the Body

Quantitatively, the major metabolic fate of glycine in the body is:

A) Conversion to serine by addition of a one-carbon unit from tetrahydrofolate.
B) Transamination and oxidation to oxalic acid.
C) Cleavage to carbon dioxide, ammonia, and a one-carbon group on tetrahydrofolate.
D) Use for heme biosynthesis by d-aminolevulinate synthetase.
E) Use for the synthesis of pyrimidine nucleotides.