$\lim _{n \rightarrow \infty} \frac{1}{n^2} \sum_{k=1}^{2n} k e^{k/n} = $

  • A
    $e^2-1$
  • B
    $e^2+1$
  • C
    $2e^2-2$
  • D
    $2e^2+1$

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