$\mathop \smallint \limits_0^\pi \sqrt {1 + 4{{\sin }^2}\frac{x}{2} - 4\sin \frac{x}{2}} \;dx = $

  • A
    $4\sqrt 3 - 4$
  • B
    $4\sqrt 3 - 4 - \frac{\pi }{3}$
  • C
    $\pi - 4$
  • D
    $\frac{2\pi }{3} - 4\sqrt 3 - 4$

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