$\lim _{n \rightarrow \infty} n\left[\frac{1}{3 n^2+8 n+4}+\frac{1}{3 n^2+16 n+16}+\ldots+\frac{1}{15 n^2}\right]=$

  • A
    $\frac{1}{2} \log \frac{9}{5}$
  • B
    $\frac{1}{4} \log \frac{9}{5}$
  • C
    $2 \log \frac{9}{5}$
  • D
    $\frac{1}{4} \log \frac{5}{9}$

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