Why is it important to use a helper when backing up a commercial vehicle?

Answer: B — To avoid blind spots

Using a helper when backing up a commercial vehicle is important primarily because it helps to avoid blind spots. Commercial vehicles, due to their size and design, have significant areas around them that the driver cannot see directly. These blind spots can lead to accidents or collisions with pedestrians, other vehicles, or obstacles that the driver might not be aware of. A helper, positioned outside the vehicle, can provide visual guidance and alert the driver to any potential dangers in these blind spots, thereby enhancing safety during the maneuver. While assisting with parking angles, checking fuel levels, and monitoring cargo security are relevant considerations in commercial driving, they do not address the immediate safety concerns associated with backing up. The presence of a helper specifically aids in maintaining a clear awareness of the surroundings, significantly reducing the likelihood of accidents during this challenging maneuver.