A protein 'X' with molecular weight of 70,000 u, on hydrolysis gives amino acids. One of these amino acid is

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Proteins are biopolymers made exclusively of -amino acids. When hydrolyzed, they yield their component -amino acids, where the amino group () and the carboxyl group () are attached to the same carbon atom (the -carbon).
Looking at the options, only structure (b) is an -amino acid (specifically, leucine). The other structures have the amino group attached to  or  carbons, which do not naturally occur in proteins.

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