Final answer:
The average 8- to 18-year-old spends 3 hours or more per day on average in front of a screen with little to no physical activity. This sedentary lifestyle is in stark contrast to established exercise programs of various intensities, reiterating the importance of balancing screen time with physical activity. Hence, option (d) is correct.
Step-by-step explanation:
The question is asking about the average amount of time that 8- to 18-year-olds spend in front of a screen every day, engaging in activities that involve very little to no physical activity. Based on various studies and reports, it has been observed that most people now spend several thousand hours a year sitting in front of screens such as televisions and computers, which translates to several hours per day. Therefore, the correct answer to the question is d. 3 hours or more.
Exercise programs and activity levels are commonly discussed in terms of intensity and duration. For instance, a moderate exercise program might consist of about 1 hour per day, while an endurance program could involve 1-3 hours per day of moderate to high-intensity exercise.
Comparatively, screen time is generally not physically demanding and represents a sedentary activity. Bearing in mind the sedentary nature of screen time and its prevalence in today's society, the extent of unsupervised screen time can exceed 10 hours in some cases, though this is less common with probabilities such as 0.0918 for less than one hour and less than 0.0001 for more than 10 hours a day.