Question

The coordinates of the endpoints of AB¯¯¯¯¯ and CD¯¯¯¯¯ are A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4). Which condition proves that AB¯¯¯¯¯∣∣∣∣CD¯¯¯¯¯?

A. (y4−y2x4−x2=y3−y1x3−x1)

B. (y4−y3y2−x1=x4−x3x2−x1)

C. (y4−y3x4−x3=y2−y1x2−x1)

D. (y2−y1x4−x3=x2−x1y4−y3)