What reflects a driver's lack of awareness of surroundings while driving?

A driver's lack of awareness of their surroundings while driving is most clearly indicated by distractions such as adjusting clothing. This action demonstrates that the driver is not fully focused on the road and their immediate environment, which is crucial for safe driving. When a driver is distracted, their attention shifts away from the task at hand, increasing the risk of not noticing other vehicles, pedestrians, or potential hazards.

In contrast, consistent lane changes and the use of hand signals can be seen as part of driving behavior that either requires attention to surrounding conditions or is a method of communicating intentions to other drivers. Proper mirror checks are indicative of a driver who is actively engaged and aware of their situational surroundings, suggesting that they are taking the right steps to ensure safety on the road. Thus, option C stands out as the most direct indicator of a lack of awareness while driving.