If $x = t^2$ and $y = t^3$,then $\frac{d^2y}{dx^2} =$

  • A
    $\frac{3}{2}$
  • B
    $\frac{3}{4t}$
  • C
    $\frac{3}{2t}$
  • D
    $\frac{3t}{2}$

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