$x\sqrt{1 + y} + y\sqrt{1 + x} = 0$,then $\frac{dy}{dx} = $

  • A
    $1 + x$
  • B
    $(1 + x)^{-2}$
  • C
    $-(1 + x)^{-1}$
  • D
    $-(1 + x)^{-2}$

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