Explanation

(b)
Only 1${^\circ}$ aromatic amine (primary aromatic amine) from diazonium salts at low temperature (0${^\circ} - 5℃$). A reaction in which $–NH_{2}$ group is converted into diazo group $( - N^{+} \equiv N)$ is called diazotization. Diazotized salts are stable in cold aqueous solution.
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Amines, so undergo diazotization but $C_{6}H_{5}CH_{2}NH_{2}$ (aliphatic amine) will not undergo diazotisation.