$\lim _{n \rightarrow \infty} \frac{1}{n^3} \sum_{k=1}^n k^2 x = $

  • A
    $x$
  • B
    $\frac{x}{2}$
  • C
    $\frac{x}{3}$
  • D
    $\frac{x}{4}$

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