Children passenger below _____ of age are required to use a child restraint.

What this question teaches

For the question "Children passenger below _____ of age are required to use a child restraint.", the correct answer is "8 years." because reduced grip and longer stopping distance mean the safest answer is the one that adds control and safety margin; the other choices such as "10 years." and "9 years." do not fit the rule as well.