If $x = at^2$ and $y = 2at$,then $\frac{d^2y}{dx^2} = $

  • A
    $-\frac{1}{t^2}$
  • B
    $\frac{1}{2at^3}$
  • C
    $-\frac{1}{t^3}$
  • D
    $-\frac{1}{2at^3}$

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