Final answer:
Vertical disparity enhances horizontal disparity to increase depth perception (A). Depth perception arises from the brain's ability to process the different images seen by each eye due to their unique perspectives. Binocular disparity is a crucial binocular cue for perceiving depth.
Step-by-step explanation:
Vertical disparity assists by promoting horizontal disparity to A) increase depth perception. Our world is inherently three-dimensional, and our brains utilize various cues to interpret this depth from the two-dimensional images projected onto our retinas. Since our eyes are positioned differently, each eye captures a slightly distinct image, and these images have discrepancies or disparities in the horizontal plane (horizontal disparity). Our brains then combine these signals to perceive depth, a binocular cue known as binocular disparity.
Monocular cues also contribute to depth perception and include elements such as size, overlap, and relative position which can be perceived by one eye alone. However, binocular cues like binocular disparity require both eyes to work together and are more effective for perceiving depth. This ability is crucial for tasks where depth perception is important, such as catching a ball or judging the distance while driving.