In what scenario is it mandatory to use a seatbelt?

Answer: C — For all passengers in the vehicle

Using a seatbelt is mandatory for all passengers in the vehicle to ensure maximum safety during travel. This requirement stems from the understanding that in the event of an accident, seatbelts significantly reduce the risk of serious injury or death for everyone in the car, not just the driver. This rule emphasizes the importance of collective safety. If only some passengers are restrained, it can lead to greater harm, as unrestrained individuals can be thrown around the vehicle or into others, putting everyone at greater risk. Therefore, the law mandates that all occupants, whether in the front or back seats, are to be properly secured with a seatbelt to enhance overall safety on the road.