$\frac{d}{dx} \left( \lim_{y \to 2} \frac{1}{y-2} \left( \frac{1}{x} - \frac{1}{x+y-2} \right) \right) = $

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

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