If the equations $x^2+p x+2=0$ and $x^2+x+2 p=0$ have a common root then the sum of the roots of the equation $x^2+2 p x+8=0$ is

• A

  $-3$
• B

  $3$
• Correct answer
  C

  $6$
• D

  $-6$

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