The following line graphs represent the running speed in proportion to the fastest speed possible for three different students. Each point on the graph denotes the time of one of the four laps run. Please answer the following question based on the information in the graph. Which student demonstrated a constant running speed for all their laps? A line graph showing three lines, each with four markers which represent laps 1 through 4. Dara's four markers are at 100 percent. Colby's markers, from left to right, are at approximately 78 percent, 78 percent, 65 percent, and 60 percent. Ben's markers, from left to right, are at approximately 50 percent, 29 percent, 41 percent, and 37 percent. Ben Colby Dara Cannot be determined from the information provided.