The graph shows runner A won the race.

Runner A starts slow and steady at first, then he gradually increases his velocity to the goal.

Runner B was in the lead at first, but the horizontal part of the graph indicates that he stopped running for a long period of time. Runner B started running again he quickly passed runner C and he took second place.

Runner C started the race faster than A and slower than B. Runner C maintained steady velocity, he got third place.

Runner A won the race.