The way in which you quickly group the individual letters in this test item into separate words best illustrates the principle of

A) closure.
B) proximity.
C) interposition.
D) perceptual constancy.

The principle of proximity states that objects that are close to each other tend to be grouped together. In this case, the individual letters are grouped into separate words based on their proximity to one another. The letters that are near each other are grouped together to form a word.