When backing up, why is it recommended to use a spotter?

Answer: B — To avoid obstacles

Using a spotter when backing up is crucial primarily to avoid obstacles. A spotter serves as an extra set of eyes, helping to ensure that the driver has a clear view of any potential hazards that may not be visible through the vehicle's mirrors. This is especially important in larger vehicles, where blind spots can create significant safety risks. The spotter can communicate real-time information about the surroundings, guiding the driver away from obstacles and ensuring safer maneuvering. This practice is particularly beneficial in tight spaces or when there are pedestrians or other vehicles in the area, making it a pivotal safety measure in commercial driving.