If $f(9)=9$ and $f^{\prime}(9)=4$, then $\lim _{x \rightarrow 9} \frac{\sqrt{f(x)}-3}{\sqrt{x}-3}=$

• A

  $2$
• B

  $3$
• Correct answer
  C

  $9$
• D

  $4$

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