If one of the lines represented by the equation $ax^2 + 2hxy + by^2 = 0$ is $y = mx$,then
- A$bm^2 + 2hm + a = 0$
- B$bm^2 + 2hm - a = 0$
- C$am^2 + 2hm + b = 0$
- D$bm^2 - 2hm + a = 0$
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