If $L$ is a line passing through the point $(-1, 1)$ and parallel to the common line of the pairs of lines $6x^2 - xy - 12y^2 = 0$ and $15x^2 + 14xy - 8y^2 = 0$,then the equation of the pair of lines joining the origin to the points of intersection of the curve $2x^2 - xy - y^2 + x - y = 0$ and the line $L$ is

• A
  $x^2 - xy - y^2 = 0$
• B
  $x^2 + xy - y^2 = 0$
• C
  $x^2 - y^2 = 0$
• D
  $2x^2 + 3xy - 6y^2 = 0$