The correct order of increasing basic nature for the bases $NH_3, \; CH_3NH_2$ and $(CH_3)_2NH$ is :

Question

( A ) $(CH_3)_2 NH < NH_3 < CH_3NH_2$
( B ) $CH_3NH_2 < NH_3 < (CH_3)_2 NH$
( C ) $NH_3 < CH_3NH_2 < (CH_3)_2 NH$
( D ) $CH_3NH_2 < (CH_3)NH < NH_3$