$\lim _{n \rightarrow \infty} \frac{1}{n} \sum_{r=1}^{2 n} \frac{r}{\sqrt{n^2+r^2}}=$

  • A
    $\sqrt{5}-1$
  • B
    $\sqrt{5}+1$
  • C
    $\sqrt{2}-1$
  • D
    $\sqrt{2}+1$

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