$\cos 13^{\circ} \sin 17^{\circ} \sin 21^{\circ} \cos 47^{\circ} = $

  • A
    $\frac{1}{32}(1+\sqrt{2}-\sqrt{3})$
  • B
    $\frac{1}{16}(1+\sqrt{3}+\sqrt{5})$
  • C
    $\frac{1}{16}(2+\sqrt{3}-\sqrt{5})$
  • D
    $\frac{1}{32}(1+2 \sqrt{3}-\sqrt{5})$

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