One Reaction That Occurs in an Automobile Catalytic Converter Is $\rightarrow$

One reaction that occurs in an automobile catalytic converter is the conversion of nitrogen monoxide to nitrogen and oxygen. How is the rate of this reaction related to the rate at which the concentration of a reactant or product changes?
2NO(g) $\rightarrow$ N₂(g) + O₂(g)
I. Rate = $\Delta$ [NO]/ $\Delta$ t
II. Rate = - $\Delta$ [NO]/ $\Delta$ t
III. Rate = $\Delta$ [N₂]/ $\Delta$ t
IV. Rate = $\Delta$ [O₂]/ $\Delta$ t

A) I only
B) II only
C) III and IV only
D) I, III, and IV only
E) II, III, and IV only