Under what condition do the planes $b x-a y=n, c y-b z$ $=l, a z-c x=m$ intersect in a line?

• A

  $a+b+c=0$
• B

  $a=b=c$
• Correct answer
  C

  $a l+b m+c n=0$
• D

  $l+m+n=0$

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