What is the rate of the reaction $A+B\rightarrow C$ based on the following experiments:

Question

$\begin{array} {cccc} \text{Experiment} & [A]\; \text{in M} & [B]\; \text{in M} & \text{Initial Rate in Ms}^{-1}\\ 1 & 1 & 2 & 0.01\\ 2 & 1 & 8 & 0.64\\ 3 & 0.5 & 8 & 0.32\\ 4 & 1 & 1 & 0.00125\\ \end{array}$

$\begin{array}{1 1}k[A]^3 [B]^3 \\ k[A][B]^3 \\ k[A]^3 [B] \\ k[A][B] \end{array}$