Motion parallax is a cue to depth which depends exclusively on object motion. So, the correct option is (a).
When an observer moves laterally, it causes the relative motion of objects at various distances, which gives birth to the monocular depth cue known as motion parallax. Several eye movement systems are active as the observer translates, maintaining attention on a specific object in the scene.
The term "motion parallax" describes how objects that are moving across the frame at a constant speed may appear to move more when they are closer to the observer (or camera) than when they are farther away.
Therefore, motion parallax is a cue to depth which depends exclusively on object motion. So, the correct option is (a).
Learn more about motion parallax here;
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