The Rate of Reaction in the Following Reaction: 2I (G) $\rightarrow$

The rate of reaction in the following reaction: 2I (g) + Ar (g) $\rightarrow$ I₂ (g) + Ar (g) can be defined by which of the following expressions:

A) $\text { rate of reaction: }-\frac{1}{2} \frac{\mathrm{d}[\mathrm{l}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}=\frac{\mathrm{d}\left[\mathrm{L}_{2}\right]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}$ .
B) $\text { rate of reaction: } \frac{1 \mathrm{~d}[\mathrm{l}]}{2}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}]}=\frac{\mathrm{d}\left[\mathrm{I}_{2}\right]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}$ .
C) $\text { rate of reaction: } \frac{\mathrm{d}[]^{2}}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}=\frac{\mathrm{d}\left[\mathrm{I}_{2}\right]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}$ .
D) $\text { rate of reaction: } \frac{2 \mathrm{~d}[\mathrm{l}]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}=\frac{\mathrm{d}\left[\mathrm{l}_{2}\right]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{Ar}]}{\mathrm{dt}}$ .