The kinetic data recorded at $$278\ \mathrm K$$ for the reaction $$\mathrm{NH_4^+(aq)+NO_2^-(aq)
ightarrow N_2(g)+2H_2O(l)}$$ are shown in the table. The kinetic rate expression and the unit of rate constant are respectively
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A

$$k[\mathrm{NH_4^+}][\mathrm{NO_2^-}]$$ and $$\mathrm{M\,s^{-1}}$$

B

$$k[\mathrm{NH_4^+}]$$ and $$\mathrm{s^{-1}}$$

C

$$k[\mathrm{NH_4^+}][\mathrm{NO_2^-}]$$ and $$\mathrm{M^{-1}\,s^{-1}}$$

D

$$k[\mathrm{NO_2^-}]$$ and $$\mathrm{s^{-1}}$$