The correct option is C Urea
Urea NH2CONH2:
Percentage of nitrogen = 2860×100=46.66%
Similarly, for Ammonium Sulphate, NH4)2(SO4) Percentage of nitrogen =21.2%
For Calcium cyanamide, Percentage of nitrogen CaCN2 =21.2%
For ammonium nitrate, NH4NO3=35.0%.