$\lim _{n \rightarrow \infty}\left[\frac{1^3}{1-n^4}+\frac{2^3}{1-n^4}+\ldots +\frac{n^3}{1-n^4}\right]=$

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{2}$
  • D
    $-\frac{1}{4}$

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