$\int_{-\pi / 8}^{\pi / 8} \frac{\sin ^4(4 x)}{1+e^{4 x}} d x=$

  • A
    $\frac{3 \pi}{128}$
  • B
    $\frac{3 \pi}{256}$
  • C
    $\frac{3 \pi}{64}$
  • D
    $\frac{3 \pi}{32}$

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