John has more difficulty hitting baseballs that are pitched to him than his classmates do because he was born blind in his right eye. his difficulty can best be attributed to his lack of the depth cue known as
a. proximity.
b. linear perspective.
c. retinal disparity.
d. interposition.

C. retinal disparity.

Explanation:

Retinal disparity simply means that each eye receives a slightly different image due to the different angle from which each eye sees an object. This causes a deficiency in depth perception which impairs an individual's vision. From this we can conclude that if John's visual difficulty is attributed to the lack of depth suggestion, we can say that John suffers from retinal disparity.