Derivative of $\sin ^2 x$ with respect to $e^{\cos x}$ is

  • A
    $2 \sin x \cos ^2 x e^{\cos x}$
  • B
    $\frac{2 \cos x}{e^{\cos x}}$
  • C
    $\frac{2 \sin x}{e^{\cos x}}$
  • D
    $\frac{-2 \cos x}{e^{\cos x}}$

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