$\sin \frac{\pi}{5} + \sin \frac{2\pi}{5} + \sin \frac{3\pi}{5} + \sin \frac{4\pi}{5} =$

  • A
    $1$
  • B
    $\sqrt{5 + 2\sqrt{5}}$
  • C
    $\frac{1}{2} \sqrt{10 + 2\sqrt{5}}$
  • D
    $\frac{1}{4} \sqrt{10 + 2\sqrt{5}}$

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