What is the legal requirement when transporting children in a vehicle?

When transporting children in a vehicle, the legal requirement is that they must use an appropriate child restraint. This is crucial for ensuring the safety of young passengers, as child restraints are designed to protect children from injury in the event of a collision. These restraints must be suitable for the child's age, weight, and height, helping to secure them safely in place.

Using an appropriate child restraint significantly reduces the risk of serious injury or death in an accident. It's important to understand that simply sitting in a standard seatbelt or sitting in a different seat without proper restraints does not provide adequate protection for children. Ensuring that all passengers, particularly children, are securely fastened in the right type of restraint is not just a legal obligation but also a fundamental safety measure. The other options do not reflect legal safety standards set to protect child passengers effectively.