$\lim _{x \rightarrow 2} \frac{\sqrt{1+4 x}-\sqrt{3+3 x}}{x^3-8} = $

  • A
    $\frac{1}{72}$
  • B
    $\frac{1}{36}$
  • C
    $\frac{1}{24}$
  • D
    $\frac{1}{12}$

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