In terms of safety, what is the main benefit of wearing a seatbelt?

Wearing a seatbelt is primarily about safety, particularly in the event of an accident. The main benefit of wearing a seatbelt is that it helps prevent ejection from the vehicle during a collision. When an impact occurs, the force can cause unrestrained occupants to be thrown from the vehicle, which greatly increases the likelihood of serious injury or fatality. Seatbelts are designed to keep passengers securely inside the vehicle, thereby significantly reducing the risk of being ejected and enhancing overall survivability in a crash.

The other options, while they may touch on aspects related to vehicle comfort or efficiencies, do not directly address the fundamental safety benefits provided by wearing a seatbelt. Comfort during travel and ease of exit are secondary considerations and not the primary function of a seatbelt in emergency situations. Fuel efficiency is also unrelated to seatbelt usage, as it pertains to the vehicle's operating conditions rather than passenger safety. Thus, the pivotal role of a seatbelt in maintaining occupant protection during collisions substantiates its importance as a safety measure.