$\lim _{x \rightarrow 0} \frac{8}{\sin ^8 x} \left\{1-\cos \left(\frac{x^2}{2}\right)-\cos \left(\frac{x^2}{4}\right)+\cos \left(\frac{x^2}{2}\right) \cos \left(\frac{x^2}{4}\right)\right\} =$

  • A
    $\frac{1}{16}$
  • B
    $\frac{1}{32}$
  • C
    $\frac{1}{64}$
  • D
    $\frac{1}{8}$

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