Answer:
D. 1 hour and 15 minutes a week of swimming
Explanation:
The recommendations by the American Collge of Sports and Medicine for an adult person is to do 20-50 minutes of moderate cardio exercise on 5 days, a good start is doing 1 hour and 15 miuntes a week of swimming and keep doing more and more untill reaching the goal of 200 minutes a week divided in 5 days.