If $K = sin^6x + cos^6x$, then $K$ belongs to the interval

  • A

    $\left[ {\frac{7}{8},\frac{5}{4}} \right]$

  • B

    $\left[ {\frac{1}{5},\frac{5}{8}} \right]$

  • C

    $\left[ {\frac{1}{4},1} \right]$

  • D

    None of these

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