How does the phrase "professional track" help readers understand the 24 Hours of Le Mans? A. It helps the readers understand why the 24 Hours of Le Mans is such an easy race.
B. It helps the readers understand why the 24 Hours of Le Mans is the fastest race in the world.
C. It helps the readers understand why the 24 Hours of Le Mans is such a long race.
D. It helps the readers understand how the 24 Hours of Le Mans is different from other races.