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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