Which of the following is a key reason for using a safety belt while driving a commercial vehicle?

Answer: B — It prevents ejection during a collision

Wearing a safety belt while driving a commercial vehicle is crucial for preventing ejection during a collision. In the event of an accident, a safety belt restrains the driver and passengers inside the vehicle, significantly reducing the risk of being thrown from the vehicle, which can lead to severe injuries or fatalities. The primary purpose of a safety belt is to secure occupants, maintaining their position within the vehicle's protective structure during a crash, thus enhancing their overall safety. The other options may seem beneficial in some contexts, but they do not address the primary safety function of a seatbelt. For instance, while comfort and relaxation may be secondary benefits of proper seating, they do not embody the primary safety intent of a seatbelt. Similarly, audio clarity is not impacted by the use of a safety belt. The core function remains focused on securing individuals to protect them during unexpected and potentially life-threatening situations on the road.