If $\mathrm{y}=\operatorname{Sin}^{-1}\left(\frac{2 \mathrm{x}}{1+\mathrm{x}^2}\right)$ and $\left(\frac{\mathrm{d}^2 \mathrm{y}}{\mathrm{dx}^2}\right)_{\mathrm{x}=2}=\mathrm{k}$, then $25 \mathrm{k}=$

• A

  $(-3)^2$
• Correct answer
  B

  $(-2)^3$
• C

  $3$
• D

  $(-2)^5$

Hence, the correct answer is option: 'B'.