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. Which one of the following statements is correct about the rates at which the concentrations change as the reaction progresses?
2NO(g) $\rightarrow$ N₂(g) + O₂(g)

A) - $\Delta$ [NO]/ $\Delta$ t increases while $\Delta$ [N₂]/ $\Delta$ t decreases.
B) - $\Delta$ [NO]/ $\Delta$ t decreases while $\Delta$ [N₂]/ $\Delta$ t increases.
C) Both - $\Delta$ NO]/ $\Delta$ t and $\Delta$ [N₂]/ $\Delta$ t decrease.
D) Both - $\Delta$ [NO]/ $\Delta$ t and $\Delta$ [N₂]/ $\Delta$ t increase.
E) The relationship between $\Delta$ [NO]/ $\Delta$ t and $\Delta$ [N₂]/ $\Delta$ t depends on the reaction mechanism.