28. There are four peptides. Their sequences are: Peptide A : STRIKE Peptide B : ALLRIGHT Peptide C: CALENDAR Peptide D： HESSMAN The pI value of these four peptides should be
(A) A＞B＞D＞C
(B) C＞A＞B＞D
(C) B＞A＞C>D
(D) B＞A＞D＞C
(E)A＞B＞C＞D