18. The structure of the amino acid histidine is provided below. For the indicated bond b,

What could form the bonds ofN-C bond, b?
(A)σ(N : 2sp² ; C : 2sp²)
(B) π(N: 2p_y;C: 2p_y)
(C) π(N:2p_x;C:2p_x),
(D) σ(N:2sp³ ;C:2sp³);
(E) σ(O: 2sp³ ;H: ls)

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