If $x=f(t)$ and $y=g(t)$,then the value of $\frac{d^{2} y}{d x^{2}}$ is

  • A
    $\frac{f^{\prime}(t) g^{\prime \prime}(t) + g^{\prime}(t) f^{\prime \prime}(t)}{\{f^{\prime}(t)\}^{3}}$
  • B
    $\frac{f^{\prime}(t) g^{\prime \prime}(t) - g^{\prime}(t) f^{\prime \prime}(t)}{\{f^{\prime}(t)\}^{2}}$
  • C
    $\frac{g^{\prime}(t) f^{\prime \prime}(t) - g^{\prime \prime}(t) f^{\prime}(t)}{\{f^{\prime}(t)\}^{2}}$
  • D
    $\frac{f^{\prime}(t) g^{\prime \prime}(t) - g^{\prime}(t) f^{\prime \prime}(t)}{\{f^{\prime}(t)\}^{3}}$

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