If the equation $3 x^2-k x y-3 y^2=0$ represents the bisectors of the angles between the lines $x^2-3 x y-4 y^2=0$,then the value of $k$ is

  • A
    -$6$
  • B
    -$10$
  • C
    $6$
  • D
    $10$

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