A. Motion Parallax is detected because we perceive binocular disparity.
The depth perception is the ability to see the world in three dimensions. It arises from a variety of depth cues like the binocular and monocular cues. In binocular cues, it includes disparity and yielding depth from binocular vision through exploitation of parallax.
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To make sure you it's perfect and to get a high score. This my point of view :/