Consider the Following Forms of the Amino Acid Valine (Val)

Consider the following forms of the amino acid valine (Val) . Which statement concerning these structures is false?

A) Structure I represents the form of Val present in blood at physiological pH.
B) Structure II represents the form of Val present in the basic environment of the intestines.
C) Structure III represents the form of Val present in the acidic environment of the stomach.
D) Structure IV represents the zwitterions of Val.