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 order of the $Rx^n$

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$(a)\;0\qquad(b)\;1\qquad(c)\;2\qquad(d)\;3$