The correct order of increasing basic nature for the bases `NH_(3) CH_(3)NH_(2) and (CH_(3))_(2)NH` is :
A. `CH_(3)NH_(2) lt NH_(3) lt (CH_(3))_(2)NH`
B. `(CH_(3))_(2)NH lt NH_(3) lt CH_(3)NH_(2)`
C. `NH_(3) lt CH_(3)NH_(2) lt (CH_(3))_(2)NH`
D. `CH_(3)NH_(2) lt (CH_(3))_(2)NH lt NH_(3)`