What is the purpose of a safety belt?

The purpose of a safety belt is to protect occupants during a crash by preventing ejection from the vehicle. Safety belts are designed to secure passengers, minimizing movement within the vehicle during sudden stops or crashes. By restraining individuals, safety belts help to distribute the force of a collision over stronger parts of the body and reduce the risk of injury. Additionally, they significantly lower the likelihood of being thrown from the vehicle, which is crucial in high-impact accidents where ejections can lead to severe injuries or fatalities.

In contrast, options such as entertaining passengers or helping the driver see better do not reflect the actual function of a safety belt. Safety belts have no role in the vehicle's visual capabilities or entertainment aspects, nor do they influence the closing of the doors. Door integrity is maintained through their design and latching mechanisms, not through the use of safety belts. Therefore, choice C clearly represents the primary and vital role that safety belts play in vehicle safety.