Final answer:
The seven-year old who is 4 feet 7 inches tall requires a child restraint system, as they are below the general height threshold of 4 feet 9 inches which is often used to determine the need for such a system.
Step-by-step explanation:
Child restraint systems are designed to protect children in vehicles. The requirements for such systems often depend on a combination of age, weight, and height. In general, children under the age of 8 or under 4 feet 9 inches tall are required to use a child restraint system. Looking at the options provided:
- A six-year old who is 4 feet 10 inches tall would not require a child restraint system as they are above the typical height threshold.
- A seven-year old who is 4 feet 7 inches tall would require a child restraint system as they are below the height threshold.
- An eight-year old who is 4 feet 9 inches tall is right at the common height threshold. Local laws might vary, so it would be best to check the specific regulations in your area. However, typically, a child at this height might transition out of a child restraint system.
In this scenario, the seven-year old who is 4 feet 7 inches tall would require a child restraint system, given that they have not reached the typical height requirement of 4 feet 9 inches.