Which of the Characteristics of Collagen Structure Listed Below Contrubute

Multiple Choice

Which of the characteristics of collagen structure listed below contrubute to the tensi le strength of collagen?
I.Collagen is made up of a triplet helix where 3 left-handed helices twist together in a right handed sense.
II.Collagen includes at repeating sequence of amino acids with glycine every 3 amino acids in a helix with about 3 amino acids per turn.
III.The three left-handed helices are staggered to allow close packing between glycine residues and rigidity from the bulky and inflexible proline/hydroxyproline.

A) I
B) I and II
C) I, II, and III
D) II and III
E) I and III