Which of following is correct ?

Question

A$\mathop {C{H_3} - C{H_2} - C{H_2} - N{H_2}}\limits_{{\rm{Functional \,isomers}}} $ , $CH_3-CH_2-NH-CH_3$
B$CH_3-NH_2, CH_3-NH-CH_3$, $\begin{array}{*{20}{c}}
{CH{ _3} - N - C{H_3}}\\
|\\
{\,\,\,\,\,\,\,C{H_3}\,}
\end{array}$ Homologue
C$CH_3-NH_2 > CH_3-NH-CH_3 >$ $\begin{array}{*{20}{c}}
{CH{ _3} - N - C{H_3}}\\
|\\
{\,\,\,\,\,\,\,C{H_3}\,}
\end{array}$ Basic behaviour in gaseous phase
D$\mathop {\begin{array}{*{20}{c}}
{CH{ _3} - N - C{H_3}}\\
|\\
{\,\,\,\,\,\,\,C{H_3}\,}
\end{array}}\limits_{{\rm{Boiling point}}} >$ $CH_3-NH-CH_3 > CH_3-NH_2$

Difficult

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