A child passenger restraint system is required for which of the following?

A child passenger restraint system, commonly known as a car seat, is essential for ensuring the safety of children during vehicle travel. In many jurisdictions, including Montana, laws specify age and weight limits for using these restraint systems.

In this scenario, the correct choice reflects that a five-year-old weighing 55 pounds still requires the use of a child passenger restraint system. Generally, the regulations indicate that children should be secured in a booster seat until they reach a certain weight limit, often around 60 to 100 pounds, depending on the specific legislation. Since the child in this option is still under the maximum weight limit encouraged for booster seats, a restraint system is necessary for their safety.

The other options represent children who are either lighter or within a similar weight range, but at 55 pounds, this particular choice emphasizes the importance of adhering to safety regulations that require restraint systems based on both age and weight benchmarks. Thus, even at the age of five and with a weight of 55 pounds, proper safety equipment is vital to reduce the risk of injury in the event of a car accident.