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

  • A
    $\frac{3}{8}$
  • B
    $\frac{15}{32}$
  • C
    $\frac{12}{25}$
  • D
    $\frac{35}{72}$

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