Final answer:
Daydreaming or mind-wandering is an example of a cognitive distraction because it diverts the driver's mental focus from the task of driving to unrelated thoughts, affecting cognitive processes required for safe driving.
Step-by-step explanation:
Out of the options provided, daydreaming or mind-wandering is an example of a cognitive distraction. Cognitive distractions occur when the mind is not focused on the task at hand. For instance, daydreaming while driving takes the driver's attention away from the road, which can be dangerous. Adjusting the radio, talking to a passenger, and eating while driving are also distractions, but they involve physical actions or interactions that may not necessarily take the driver's mind off the road. Daydreaming, however, directly affects cognitive processes required for safe driving as it diverts mental resources from driving to unrelated thoughts.