$\int_0^{\pi} \frac{dx}{4+3 \cos x} = $

  • A
    $\frac{2 \pi}{7}$
  • B
    $\frac{\pi}{\sqrt{7}}$
  • C
    $\frac{\pi}{2 \sqrt{7}}$
  • D
    $\frac{\pi}{7}$

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