Final answer:
The correct answer is Option D: Adults should engage in at least 150 minutes (2 hours and 30 minutes) per week of moderate-intensity aerobic activity, as per the U.S. Department of Health and Human Services guidelines.
Step-by-step explanation:
Considering the guidelines set forth by the U.S. Department of Health and Human Services (HHS), the appropriate amount of exercise for adults is at least 150 minutes (2 hours and 30 minutes) per week of moderate-intensity aerobic activity. Moderate-intensity activities are those where you can talk but not sing. For children aged 6-17 years, it is recommended they participate in 60 minutes (1 hour) per day of physical activity, which should include aerobic, muscle-strengthening, and bone-strengthening exercises. For older adults, aged 65 and older, the recommendation is also to be as physically active as their abilities and conditions allow; they should do activities that maintain or improve balance if they are at risk of falling, aiming for at least 150 minutes of moderate-intensity exercise each week.
Therefore, the correct option in the list provided, considering the HHS guidelines, would be Option D: Adults can exercise with moderate intensity for two hours and thirty minutes per week. While some physical activity is better than none, increasing the duration and intensity can provide additional health benefits.