A ray of light is incident along the line $x = 2y$ and hits a mirror. The angle of incidence equals the angle of reflection. Find the equation of the reflected ray passing through the point $(2, 1)$.
(A) $4x - 3y = 5$ \quad (B) $3x - 4y = 2$ \quad (C) $x - y = 1$ \quad (D) $2x - y = 3$