Which reagent can provide distinction between aliphatic $-NH_2$ group and aromatic $-NH_2$ group?

Question

$\begin{array}{1 1}(a)\;\text{Benzene sulphonyl chloride}&(b)\;CHCl_3/KOH\\(c)\;CH_3COCl&(d)\;\text{Benzene diazonium chloride}\end{array}$