The equation of the pair of lines passing through the origin and parallel to the lines $y = m_1x + c_1$ and $y = m_2x + c_2$ is:
- A$m_1m_2x^2 - (m_1 + m_2)xy + y^2 = 0$
- B$m_1m_2x^2 + (m_1 + m_2)xy + y^2 = 0$
- C$m_1m_2y^2 - (m_1 + m_2)xy + x^2 = 0$
- D$m_1m_2y^2 + (m_1 + m_2)xy + x^2 = 0$
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