If $r(1 - m^2) + m(p - q) = 0$,then a bisector of the angle between the lines represented by the equation $px^2 - 2rxy + qy^2 = 0$ is

  • A
    $y = x$
  • B
    $y = -x$
  • C
    $y = mx$
  • D
    $my = x$

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