Until what height should a child remain in a booster seat?

The recommendation is for children to remain in a booster seat until they reach a height of 4 feet 9 inches. This height is significant because it typically ensures that the vehicle's seat belt fits properly across the child's body. Proper fit means the lap belt lies snugly across the upper thighs and the shoulder belt crosses the chest and shoulder without digging into the neck.

Staying in a booster seat until this height helps protect children from injury in the event of a car crash by ensuring the seat belt functions correctly for optimal safety. Most state laws and safety guidelines endorse this height requirement to provide a clear standard for parents and caregivers, making option B the correct choice.

Other alternatives do not address the proper fit of the seat belt based on height. For example, the first option might suggest a premature transition to an adult seat belt, which could put a child at a higher risk in a crash. Similarly, claiming that age or weight alone dictate car seat transitions overlooks the crucial aspect of height, which plays an essential role in safety.