When you first put your hat on, you can feel it quite easily, but after a while, you forget that you are wearing a hat at all-the sensation is gone. What happens?

A) sensory fatigue
B) subliminal perception
C) habituation
D) perceptual defense

Habituation is the decrease in response to a stimulus after repeated exposure to it. In the case of wearing a hat, the sensation is new and noticeable at first, but eventually, the brain habituates to the feeling and stops registering it as important, so the sensation is no longer consciously perceived.