Which of the following statement best explains why cities are so densely populated?

More choices.

Explanation:

Cities are very densely populated because there are a lot of opportunities for a job. There are also plenty of places to send children to school. In bigger cities there are also more schools so if you were going to school you could have a choice on which school you wanted to go to. There would also be responses to bad weather such as a lot of snow the plows would be out or if there was an issue at home there are homes and shelters.