Following amino acid has been found in protein prothrombin, but remaines undetected due to the formation of another common acid (A)

ldentify A.

Options

A. `H_(3)N^(o+)-underset(CH_(2)-CH_(2)-CO O^(o+))underset(|)(CH)-CO O^(o+)`
B.
C. `H_(2)N-underset(CH_(2)COOH)underset(|)(CH)-CO O^(o+)`
D.

Answer

A

Explanation