<u>ANSWER:
</u>
The following schedules follow the guidelines for a teenager's daily physical activity:
A. 30 minutes practicing gymnastics and 30 minutes cycling
B. 30 minutes playing soccer, 20 minutes climbing a rock wall, and 10 minutes practicing yoga
<u>EXPLANATION:
</u>
As per the guidelines, an adolescent should do 60 minutes of physical activity daily, which should include aerobic, muscle strengthening, and bone-strengthening activities. Only options a and b satisfy the requirements, based on the above mentioned physical activities.