More be the ability of nitrogen atom to donate the lone pair of electrons over it, more be the basic nature of the given amine. The basic strength of alkyl amines in the aqueous state is decided by three factors-Inductive effect, solvation effect and steric hinderance of alkyl group. In water, amines form hydrogen bonds with Water. As 3° amines are less protonated in aqueous solution, the correct order of basic nature of amines in water is 2° amine >3° amine >1° amine. Hence, order of basic nature of amines: (CH3)2NH>(CH3)3N>CH3−NH2 Therefore (c) is the correct option.