What does a driver need to monitor constantly while driving?

Answer: B — Other vehicles and pedestrians

While driving, it is essential for a driver to constantly monitor other vehicles and pedestrians. This vigilance is crucial for ensuring safety on the road. By being aware of the movements and positions of other road users, a driver can react appropriately to potential hazards, such as changing lanes or stopping suddenly. This awareness helps prevent accidents and ensures a safer driving environment for everyone. While monitoring the GPS system, the dashboard indicators, and the time remaining until arrival can also be important to a driver's overall driving experience, these factors do not directly impact immediate safety on the road as much as being aware of other vehicles and pedestrians does. A driver could be focused on their navigation or dashboard readings but still be unaware of a pedestrian crossing in front or a vehicle encroaching into their lane, which could lead to dangerous situations. Hence, the primary focus should always be on the surrounding traffic and pedestrians.