If the system of simultaneous linear equations $x-2 y+z=0,2 x+3 y+z=6$ and $x+2 y+p z=q$ has infinitely many solutions, then

• A

  $p+q=4$
• B

  $p q=\frac{48}{49}$
• Correct answer
  C

  $q-p=3$
• D

  $\frac{p}{q}=4$

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