A transit company operates commuter trains to help people get to the city each day. Each train travels on a straight route to and from the farthest station, stopping at other stations along the route. The graph shows the distance, y miles, the train is from the station after x minutes. What is the farthest distance, in miles, the train is located from the station at any time? A: 100
B: 80
C: 40
D: 20