Choose the Correct Answer from the List Below

Choose the correct answer from the list below. Not all of the answers will be used.
-The methyl group donor _______________ is the product of the first step of methionine degradation.

A) hyperammonemia
B) aminotransferases
C) methionine
D) S-adenosylmethionine
E) glutamate dehydrogenase
F) oxaloacetate
G) biopterin
H) glutamate
I) hippurate
J) urea
K) dehydratase
L) dioxygenases
M) ammonia disorder