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

  • A
    $2$
  • B
    $e^{2\left(1-\frac{1}{2^k}\right)}$
  • C
    $2\left(1-\frac{1}{2^k}\right)$
  • D
    $e^2$

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