A 55-year old man presents to his primary care physician with bouts of dizziness and confusion.He is diagnosed with hyperhomocysteinemia due to a...

A 55-year old man presents to his primary care physician with bouts of dizziness and confusion. He is diagnosed with hyperhomocysteinemia due to a deficiency of cystathionine-ß synthase. In this individual which of the following amino acids could potentially become essential?

Methionine

Valine

Histidine

Alanine

Cysteine