The Following Reaction Occurs in Aqueous Solution

The following reaction occurs in aqueous solution:
NH₄⁺ (aq) + NO₂^- →N₂ (g) + 2H₂O (l)
The data below is obtained at 25°C.
The order of the reaction in NH₄⁺ is _ .

A) - 2
B) +2
C) - 1
D) 0
E) +1