Speeding is an issue that every one that is on the road should be more careful about. There are different reasons why people do it. The most common are adrenaline and the necessity to be on time. Many people like to feel adrenaline when they are driving and they go very fast. Some others need to arrive at a place in the fastest way and that's why they do speeding.
C, details that help readers visualize the settings better. A wouldn't work because it doesn't help the setting, B doesn't help the setting either and D would only add more confusion so UT would have to be C by process of elimination.
