How Can the Müller-Lyer Illusion Be Explained

How can the Müller-Lyer illusion be explained?

A) The visual cues of overlap and binocular disparity produce the illusion of a three-dimensional object.
B) We correctly perceive the two lines as being identical in length, but motion parallax creates the illusion that one line is longer than the other.
C) We assume that the figure is moving and that the ground or frame is stationary.
D) Visual depth cues create the perception that one line is farther away from us, which leads us to perceive that line as being longer.