Which of the following best paraphrases the underlined sentence in paragraph 2?

A significant factor in city crime is the absence of casual social interaction and a lack of concern for strangers’ problems.

People who do not have personal acquaintances in the city are more likely to become victims of crime and misfortune.

Urban crime is primarily driven by the fact that city dwellers do not know how to help strangers who are in trouble.

The main cause of crime in urban areas is that residents are too busy to establish formal social contacts with their neighbors.