What type of graph would be best for displaying a runner's speed throughout a race?

A line graph would be the best choice for displaying a runner's speed throughout a race. This type of graph allows for clear visualization of changes in speed over time, showing trends and fluctuations effectively. The x-axis can represent time, while the y-axis represents speed, making it easy to see how the runner's pace varies during the race. Additionally, line graphs can illustrate multiple segments or laps, providing a comprehensive view of performance.