(B) The reaction sequence is as follows:$R-C \equiv N \xrightarrow{H_3O^+} R-COOH$ (Acidic hydrolysis of nitrile gives carboxylic acid).$R-C \equiv N

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(B) The reaction sequence is as follows:$R-C \equiv N \xrightarrow{H_3O^+} R-COOH$ (Acidic hydrolysis of nitrile gives carboxylic acid).$R-C \equiv N \xrightarrow{[H]} R-CH_2NH_2$ (Reduction of nitrile gives primary amine).Therefore,'$X$' is a nitrile $(R-C \equiv N)$.