What is the purpose of a seat belt?

The purpose of a seat belt is to secure occupants and reduce injury during a crash. Seat belts are designed to restrain passengers in their seats during a sudden stop or collision, minimizing the risk of ejection from the vehicle and significantly reducing the likelihood of severe injuries. During a crash, unrestrained occupants can be thrown against the interior of the car or ejected from it, leading to serious or fatal injuries. By keeping occupants securely fastened in place, seat belts help to distribute the forces of a crash over stronger parts of the body, such as the chest and pelvis, thereby enhancing safety.

While the other options reference various aspects of driving safety and comfort, they do not accurately capture the primary function of seat belts in a vehicle.