If $x^2-5 x+6$ is a factor of $f(x)=x^4-17 x^3+k x^2-247 x+210$, then the other quadratic factor of $f(x)$ is

• A

  $x^2+12 x+35$
• Correct answer
  B

  $x^2-12 x+35$
• C

  $x^2-6 x+35$
• D

  $x^2+6 x+35$

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