A body starts from origin and moves along $x$-axis so that its position at any instant is $x=4 t^2-12 t$ where $t$ is in second and $v$ in m/s. What is the acceleration of particle is ............. $m / s ^2$

  • A

    $4$

  • B

    $8$

  • C

    $24$

  • D

    $0$

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