15. Human beings can see the spatial relations among
objects by processing information conveyed by light.
Scientists trying to build computers that can detect
spatial relations by the same kind of process have so
far designed and built stationary machines.
However, these scientists will not achieve their goal
until they produce such a machine that can move
around in its environment.
Which of the following, if true, would best support
the prediction above?
(A) Human beings are dependent on visual cues
form motion in order to detect spatial relations.
(B) Human beings can often easily detect the spatial
relations among objects, even when those
objects are in motion.
(C) Detecting spatial relations among objects
requires drawing inferences from the infor-
mation conveyed by light.
(D) Although human beings can discern spatial
relations through their sense of hearing,
vision is usually the most important means of
detecting spatial relations.
(E) Information about the spatial relations among
objects can be obtained by noticing such
things as shadows and the relative sizes of