This movement, called the Great Migration, would transform urban
America and recast the social and political order of the country as a
whole. In particular, Detroit, Chicago, and other midwestern industrial
cities experienced significant demographic changes.
Which choice most effectively sets up the examples discussed in the
following sentence?
A. NO CHANGE
B. The social and political order of every city it touched.
C. How people interacted socially and politically.
D. The social and political order of everyday life.