If methyl is alkyl group, then which order of basicity is correct [RPMT 1997]

• A.                 \[{{R}_{2}}NH>RN{{H}_{2}}>{{R}_{3}}N>N{{H}_{3}}\]
• B.                 \[{{R}_{2}}NH>{{R}_{3}}N>RN{{H}_{2}}>N{{H}_{3}}\]
• C.                 \[RN{{H}_{2}}>N{{H}_{3}}>{{R}_{2}}NH>{{R}_{3}}N\]
• D.                 \[N{{H}_{3}}>RN{{H}_{2}}>{{R}_{2}}NH>{{R}_{3}}N\]