A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the half life for the $Rx^n(t_{\large\frac{1}{2}})$

Question

$(a)\;6\times 10^{-5}\qquad(b)\;6\times 10^5\qquad(c)\;3\times 10^5\qquad(d)\;3\times 10^{-5}$