In the diagram below, the plane drawn behind the peptide bond indicates the:
A.
absence of rotation around the C—N bond because of its partial double-bond character.
B.
plane of rotation around the C a —N bond.
C.
region of steric hindrance determined by the large C=O group.
D.
region of the peptide bond that contributes to a Ramachandran plot.
E.
theoretical space between –180 and +180 degrees that can be occupied by the f and y angles in the peptide bond.