If $x=\log _{0.1} 0.001$ and $y=\log _9 81$,then $\sqrt{x-2 \sqrt{y}}$ is equal to

  • A
    $3-\sqrt{2}$
  • B
    $\sqrt{3}-2$
  • C
    $\sqrt{2}-1$
  • D
    $\sqrt{2}-2$

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