For the estimation of nitrogen, $1.4\; g$ of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60 \;mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid require$20\; ml$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:

Question

( A ) 6%
( B ) 5%
( C ) 10%
( D ) 3%