Which of the following is supported by the National Highway Traffic Safety Administration regarding child safety?

The correct response highlights the importance of a child's age, height, and weight in determining how they should be secured in a vehicle. This is crucial for their safety, as the National Highway Traffic Safety Administration (NHTSA) emphasizes that these factors influence the type of restraint system—such as car seats, booster seats, or seat belts—that provides the best protection for children in the event of a crash.

Research and guidelines from the NHTSA reveal that not only age but also the physical size of a child plays a significant role in ensuring they are adequately protected while traveling. For instance, younger children typically need to be in rear-facing car seats, while older ones may transition to forward-facing seats and eventually booster seats based on their size. Thus, understanding that each child's unique characteristics are critical in securing them properly in a vehicle reinforces safe travel practices.

The other options do not align with the NHTSA's guidelines and therefore lack the necessary emphasis on the appropriate safety measures for children in vehicles.