In An $\alpha$ -Helix, a Hydrogen Bond Is Formed Between the Carbonyl Oxygen

Multiple Choice

In an $\alpha$ -helix, a hydrogen bond is formed between the carbonyl oxygen of the i^th residue and the amide hydrogen _____ residues away

A) i + 1
B) i + 2
C) i + 3
D) i + 4
E) i + 5