Determine the Overall Order of the Reaction H₂(g) + 2ICl(g) $\rightarrow$

Determine the overall order of the reaction H₂(g) + 2ICl(g) $\rightarrow$ I₂(g) + 2HCl(g) from the following data: $\begin{array} { c c c c }\text { Experiment } && P_{\text {PCI }} \text { (torr) } & \text { Rate (torr/s) }\\ & P _ { \mathbf { H } _ { \mathbf { 2 } } } & & \\ & \text { (torr) } & & \\ 1 & 250 & 325 & 1.34 \\ 2 & 250 & 81 & 0.331 \\ 3 & 50 & 325 & 0.266 \end{array}$

A) first
B) second
C) third
D) fourth
E) zero