$\int_0^\pi \frac{x \sin x}{\sin ^2 x+2 \cos ^2 x} d x=$

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{\pi^2}{2}$
  • C
    $\frac{\pi^2}{4}$
  • D
    $\frac{\pi}{4}$

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