$\int_{0}^{\pi} \frac{x \tan x}{\sec x + \tan x} dx =$

  • A
    $\frac{\pi - 2}{2}$
  • B
    $\frac{\pi + 2}{2}$
  • C
    $\frac{\pi (\pi + 2)}{2}$
  • D
    $\frac{\pi (\pi - 2)}{2}$

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