The joint equation of the pair of lines which bisects the angles between the lines $x^2+3xy+2y^2=0$ is

  • A
    $3x^2-2xy-3y^2=0$
  • B
    $3x^2+2xy-3y^2=0$
  • C
    $2x^2-3xy-2y^2=0$
  • D
    $2x^2+3xy-2y^2=0$

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