Answer:
a. retinal disparity
Explanation:
Retinal disparity -
It refers to as the capacity by which the left and the right eye visualizes any image differently , is referred to as retinal disparity .
The capability of the left and right is different .
The more is the difference between the image from each eye , more closer is the object , and vice versa .
Hence , from the given scenario of the question ,
The correct option is a. retinal disparity .