Final answer:
The most accurate estimate for the total weekly hours a typical American adolescent like Justin would spend on school and work is likely 40-45 hours, leading to option (d) being the most suitable answer.
Step-by-step explanation:
Justin is a typical American working adolescent. He would likely be busy with school and work for approximately 40-45 hours a week. This estimate can be derived from U.S. averages that account for full-time workers and students, which tend to hover around 40 hours per week for work alone. Considering that adolescents also have school responsibilities, the total weekly commitment can easily reach or slightly exceed this range when combined with part-time work hours. Thus, the best answer would be (d) 40-45 hours a week.