Sanger's Reagent (2,4-Dinitrofluorobenzene) Reacts with the Following to Give, After

Sanger's reagent (2,4-dinitrofluorobenzene) reacts with the following to give, after complete hydrolysis,

A) no labeled amino acids.
B) one labeled and two unlabeled amino acids.
C) one labeled and three unlabeled amino acids.
D) two labeled and one unlabeled amino acids.
E) two labeled and two unlabeled amino acids.