${\mathrm{C}}_3{\mathrm{H}}_9\mathrm{N}$ reacts with Hinsberg reagent and the product is insoluble in alkali but soluble in ether. This nitrogen containing compound is

A secondary amine with the formula ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NHCH}}_3$ react with the Hinsberg reagent and form another secondary amine that contains phenyl sulphonyl group

The obtained secondary amine is soluble in ether but not in alkali                           

Hence the correct option is B.