Who should use booster seats according to safety guidelines?

The correct answer indicates that children should use booster seats when they weigh between 40 to 60 pounds. Booster seats are designed to elevate a child so that the seat belt fits correctly over the stronger parts of the child's body. At this weight range, children can often be transitioned from a forward-facing car seat with a harness to a booster seat, which helps ensure that the standard seat belt provides optimal protection in the event of a crash.

Regarding the other options, while it may seem logical that lighter children should still be in booster seats, the specific weight range of 40 to 60 pounds aligns with safety guidelines that also factor in age and height to ensure children are safe and secure in vehicles. Additionally, the general guideline is that children under 12 years old should typically sit in the back seat to reduce the risk of injury in case of an accident, but this does not specifically address the need for booster seats or the weight they are suitable for.