Final answer:
The factor most pertinent to the statement about habituation to simple stimuli is 'exposure', as it is related to how repeated, unchanged exposure to a stimulus leads to reduced response.
Step-by-step explanation:
The statement 'Simple stimuli tend to be habituated to because they do not require attention to detail' refers to the concept that when an organism becomes less responsive or desensitized to an unchanging stimulus, this is known as habituation. Habituation is a form of non-associative learning. A related concept is sensory adaptation, where sensory receptors become less sensitive to constant stimuli. However, within the context of learning and factors leading to adaptation, the factor that is most pertinent to the statement is exposure. As organisms are exposed to a simple stimulus repeatedly without any consequential changes or rewards associated with it, they stop paying attention to it.