In which situation is the distance traveled proportional to time? a car moving in stop-and-go traffic a person biking on a trail at 1212 miles per hour for 2020 minutes a baseball hit to center field a race car slowing down after crossing the finish line

For this case, what you must do is to see in which scenario the speed of keeping constant during a certain time.
 "A person biking on a trail at 1212 miles per hour for 2020 minutes"
 We observe that the distance in this case is proportional to the time and the constant of proportionality is the speed.
 In other words:
 d = v * t
 
 the distance traveled is proportional to time in:
 "A person biking on a trail at 1212 miles per hour for 2020 minutes"

4should be the last one n=4