If ${ }^{(n-1)} C_r=\left(k^2-3\right){ }^n C_{r+1}$, then an interval containing the values of $k$, is

• A

  $(-\infty,-3]$
• Correct answer
  B

  $[-2,-\sqrt{3})$
• C

  $[-\sqrt{3}, \sqrt{3}]$
• D

  $(-\infty,-\sqrt{2}]$

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