Why should drivers stay aware of their surroundings while in the left lane?

Answer: C — To ensure safe lane changes

Staying aware of their surroundings while in the left lane is crucial for drivers to ensure safe lane changes. The left lane is often designated for passing or for faster-moving traffic, making situational awareness particularly important. By being vigilant about other vehicles, pedestrians, and road conditions, drivers can make informed decisions about when it is safe to change lanes or maneuver around slower vehicles. This awareness helps in preventing accidents and contributing to smoother traffic flow. For example, if a driver in the left lane is not attentive and suddenly decides to change lanes without checking their surroundings, they could collide with a vehicle that is already occupying that space. Thus, maintaining awareness while in the left lane directly enhances safety for the driver and others on the road.