Suburban Chicago extends into northwestern Indiana, an area known as “The Region.” Which of the following is the best categorization of this region with a valid supporting reason?
A.
formal region, because it follows the same laws as Chicago

B.
formal region, because it has access to Chicago’s restaurants

C.
vernacular region, because people’s accents are the same as in Chicago

D.
functional region, because the suburban area provides homes to people who commute to Chicago for work

E.
functional region, because it is a research and development center