If $S_1 = \sum_{r=1}^{n} r$,$S_2 = \sum_{r=1}^{n} r^2$,and $S_3 = \sum_{r=1}^{n} r^3$,then the value of $\lim_{n \rightarrow \infty} \frac{S_1(1 + \frac{S_3}{4})}{S_2^2}$ is

  • A
    $\frac{9}{16}$
  • B
    $\frac{9}{2}$
  • C
    $\frac{9}{32}$
  • D
    $\frac{9}{8}$

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