Final answer:
Children are generally required to be in a child safety seat or booster seat up to the age of 8, which corresponds to answer choice b. Always check local laws for the most precise guidance.
Step-by-step explanation:
The question pertains to child safety regulations in vehicles, specifically asking, "Up to what age are children required to be in an approved child safety seat or booster seat in all seating positions?" Generally, laws vary by state and country, but a common rule in many regions is that children up to the age of 8 must be secured in a child safety seat or booster seat appropriate for their weight and height. Answer choice b. 8 often aligns with these regulations. After surpassing this age, children may typically use the vehicle's standard seat belts, provided they fit properly.
It is important to consult local laws to get the most accurate and up-to-date information regarding child safety seats as they may have specific requirements beyond age, including height and weight considerations. Remember, the main purpose of these regulations is to ensure the safety of children while traveling in vehicles.