What is one potential sign that a driver is drowsy?

Answer: B — Difficulty focusing

Difficulty focusing is a significant indicator that a driver may be drowsy. When a driver is not fully alert, their attention can wander, making it hard to concentrate on the road, traffic signs, or the actions of other drivers. This lack of focus can lead to impaired decision-making and slower reaction times, increasing the likelihood of an accident. In contrast, frequent lane changes and accelerating rapidly are more often associated with aggressive or distracted driving rather than drowsiness. Consistent speed, while generally a sign of observant driving, does not necessarily correlate with alertness; a drowsy driver may maintain speed without being adequately aware of their surroundings. Therefore, recognizing difficulty focusing is crucial for identifying drowsiness and taking action to prevent potential accidents.