Women That Have PKU Must Avoid the Essential Amino Acid

Women that have PKU must avoid the essential amino acid phenylalanine and consume a diet low in protein because:

A) they lack enough stomach acid (HCl) to break down dietary proteins,including phenylalanine.
B) they are allergic to phenylalanine and other protein-rich foods.
C) they lack the enzyme necessary to convert phenylalanine to tyrosine.
D) phenylalanine and protein-rich foods cause an accumulation of acid to build up in the blood.
E) None of the above is correct.