The ability to see objects in three dimensions is most essential for making judgments of

A) continuity.
B) distance.
C) relative luminance.
D) connectedness.

Seeing objects in three dimensions is essential for making judgments of distance. This is because depth perception allows us to determine how far away an object is, which is important for visual tasks such as catching a ball or driving a car. Continuity, relative luminance, and connectedness are all aspects of visual perception, but they do not rely specifically on the ability to see in 3D.