What is the most logical next event?

How to train for cross country running
Try interval training.
Interval training involves alternating between periods (known as intervals) of high-intensity exercise with low-intensity exercise. Switch between sprinting and walking in 2 to 3 minute intervals.

Choose your answer from: A. Your run can last anywhere from thirty minutes to an hour, depending on the distance you choose. During the high-intensity interval, give the workout as much energy as you can to increase your strength. B. Sprint hard for 3 to 6 minutes every day. Then switch to walking at a safe distance in between your intervals. C. You can run a variety of styles between practice sessions. For example, you could alternate sprinting and walking in a 1 to 2 minute pattern. D. Intervals vary in intensity from 10 minutes to 20 minutes for aerobic, half-marathon, or endurance workouts. Between intervals, lengthen distances and complete sprints to lower your chances of injury.
A.