$\lim _{n \rightarrow \infty} \frac{1}{n}\left\{\sin ^5\left(\frac{\pi}{6 n}\right)+\sin ^5\left(\frac{2 \pi}{6 n}\right)+\sin ^5\left(\frac{3 \pi}{6 n}\right)+\ldots+\sin ^5\left(\frac{\pi}{2}\right)\right\} = $

  • A
    $\frac{8}{15 \pi}$
  • B
    $\frac{8}{5 \pi}$
  • C
    $\frac{32}{5 \pi}$
  • D
    $\frac{16}{5 \pi}$

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