If one of the lines represented by $a x^2+2 h x y+b y^2=0$ bisects the angle between the positive coordinate axes, then

• A

  $a+b=2 h$
• B

  $a-b=2 h$
• Correct answer
  C

  $a+2 h+b=0$
• D

  $a+2 h-b=0$

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