Visual recognition involves storing and retrieving memories.Neural activity, triggered by the eye, forms an image in the brains memory system that...

There is a lot of information packed into this paragraph!
However, if you read carefully and think about what that information is telling you and
how it is organized, the correct answer isn't that difficult to
identify.

Based on the opening sentence, the main topic of
the paragraph is dealing with how visual recognition processes work to allow for
memories to be created. First, the forming and storing of the visual image in the
brain's memory is explained.

Then, the debate regarding
exactly how the recognition process functions to make the match between a second
sighting of an object with the memory of that object stored in the brain's visual memory
is addressed. The first theory explained is the Gestalt idea, which says that objects
are recognized as a whole unit, all at once. A second theory holds that objects are
matched to visual memories in a step-by-step matching of features between a remembered
visualization of an object and a newly observed item.

The
correct summary of your paragraph is D. The article discusses visual recognition and
presents two hypotheses to explain how the process takes place.