B is the correct answer.
While the Indus Valley has gotten more attention in recent years, it is not considered one of the three classical civilizations.
Generally speaking, during the Gilded Age, the US government passed legislation to "<span>b. handle the great number of people living in cities," since there was a great urban shift due to widening prosperity. </span>
Highways made getting to suburbs a lot easier and a lot safer. Suburbs were also a lot safer in general than larger cites
