Final answer:
The correct response is b) 5 years old, 40 pounds. This aligns with the typical weight and physical development of children transitioning from early childhood.
Step-by-step explanation:
The question, 'Most booster seats require to be at least _____ years old and _____ pounds,' has the correct answer: b) 5 years old, 40 pounds. Booster seats are designed to ensure that children who have outgrown their forward-facing car seats can still use the car's seat belts safely. According to the information provided, children in this age and weight range are generally transitioning out of early childhood stages where they would still be rapidly growing. By the age of 5, most children would typically weigh at least 40 pounds and be of sufficient physical maturity to properly fit the vehicle's safety restraints with the aid of a booster seat.