b
when the given mixture is shaken with \(1\, M HCl\), amine get protonated and becomes cation \(\left( {RNH_2^ \oplus } \right)\) , which does not dissolve in organic solvent but usually dissolve in \(H_2O\) due to its charge. So, shaking with aqueous \(HCl\) will pull amines into the aqueous phase and leave all other compounds in organic layer