$\lim _{n \rightarrow \infty}\left(\frac{1}{\sqrt{n^2}}+\frac{1}{\sqrt{n^2-1}}+\ldots+\frac{1}{\sqrt{n^2-(n-1)^2}}\right)=$

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

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