If $x = \log t$ and $y + 1 = \frac{1}{t}$,then $e^{-x} \frac{d^{2} x}{d y^{2}} + \frac{d x}{d y} = $

  • A
    $0$
  • B
    $2$
  • C
    $-1$
  • D
    $1$

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