The Following Reaction Occurs in Aqueous Solution: NH₄⁺ (aq)

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