Answer:
The answer is The Matthew Effect.
Explanation:
This phenomenon takes place when a person preserves or improves a certain status becase he/she is placed in situations that facilitate the process. This term initially applied to socioeconomical status ("the rich get richer"), but has been used in other contexts such as education or recognition. For this reason, the effect is also called accumulated advantage.
Population density is the number of people that live in a region, divided by a specific measurement such as square miles or square kilometers.
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The headlights of the vehicle should be turned on because it is easier for other vehicles to notice you. In a way that it will avoid any accidents or complications that could lead when other vehicles fail to notice you because of having your headlight off or broke down. That is why having the headlights turned on at this hours is needed to prevent any harmful consequences.
The answer is B . I hope this will help you :D