Protein Amino Acid Side Chains Can Hydrogen Bond in the Major

Protein amino acid side chains can hydrogen bond in the major groove of DNA, and discriminate between each of the four possible base pairs. In which one of the following groups of amino acids can all three members potentially be used in such DNA-protein recognition?

A) Ala, Asn, Glu
B) Arg, Gln, Leu
C) Asn, Gln, Trp
D) Asn, Glu, Lys
E) Glu, Lys, Pro