Which one of the following structures represents the peptide chain

Q: Which one of the following structures represents the peptide chain

a (a) In peptide linkage i.e., $-CONH -$ group, the carboxyl group of one amino acid molecules forms an amide by combination with the amino group of the next amino acid molecule with the liberation of water molecule.

Question

A$ - \mathop {\mathop N\limits^| }\limits^H - \mathop C\limits_|^| - \mathop {\mathop C\limits_{||} }\limits_O - \mathop {\mathop N\limits^| }\limits^H - \mathop C\limits_|^| - \mathop {\mathop C\limits_{||} }\limits_O - \mathop {\mathop N\limits^| }\limits^H - \mathop C\limits_|^| - \mathop {\mathop C\limits^{||} }\limits^O - $
B$ - \mathop {\mathop N\limits^| }\limits^H - \mathop C\limits_|^| - \mathop C\limits_|^| - \mathop {\mathop C\limits^{||} }\limits^O - \mathop {\mathop N\limits_| }\limits_H - \mathop C\limits_|^| - \mathop C\limits_|^| - \mathop {\mathop N\limits^| }\limits^H - \mathop {\mathop C\limits_{||} }\limits_O - \mathop C\limits_|^| - \mathop C\limits_|^| - $
C$ - \mathop {\mathop N\limits^| }\limits^H - \mathop {\mathop C\limits_{||} }\limits_O - \mathop {\mathop N\limits_| }\limits_H - \mathop C\limits_|^| - NH - \mathop {\mathop C\limits^{||} }\limits^O - NH - $
D$ - \mathop {\mathop N\limits^| }\limits^H - \mathop {\mathop C\limits_{||} }\limits_O - \mathop C\limits_|^| - \mathop C\limits_|^| - \mathop C\limits_|^| - \mathop {\mathop N\limits^| }\limits^H - \mathop C\limits_|^| - \mathop C\limits_|^| - \mathop C\limits_|^| - $

AIPMT 2004, Medium

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