${{15} \over {\sqrt {10} + \sqrt {20} + \sqrt {40} - \sqrt 5 - \sqrt {80} }} = . . . $

  • A

    $\sqrt 5 (5 + \sqrt 2 )$

  • B

    $\sqrt 5 (2 + \sqrt 2 )$

  • C

    $\sqrt 5 (1 + \sqrt 2 )$

  • D

    $\sqrt 5 (3 + \sqrt 2 )$

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