In an organic compound of molar mass $108 \;g \; mol^{-1} C, \; H$ and $N$ atoms are present in $9 : 1 : 3.5$ by weight. Molecular formula can be :

Question

( A ) $C_4H_{18}N_3$
( B ) $C_6H_8N_2$
( C ) $C_7H_{10}N$
( D ) $C_5H_6N_3$