Nitrates and ammonium salts are employed as fertilisers. Which fertiliser has the largest mass of nitrogen in $50\,\text{kg}$ of the compound? $[A_r: \text{H}, 1; \text{N}, 14; \text{O}, 16; \text{S}, 32; \text{Cl}, 35.5; \text{K}, 39]$
- A$\text{NH}_4\text{Cl}$
- B$\text{NH}_4\text{NO}_3$
- C$(\text{NH}_4)_2\text{SO}_4$
- D$\text{KNO}_3$