यदि $\sum_{n=1}^k \tan ^{-1}\left(\frac{1}{n^2+3 n+3}\right)=\tan ^{-1} \alpha$ है, तो $\alpha=$

  • A
    $\frac{k}{k+2}$
  • B
    $\frac{2 k}{2 k+1}$
  • C
    $\frac{k}{2 k+5}$
  • D
    $\frac{3 k}{4 k+5}$

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