(A) ** suburbs & out west
(B) northern cities
(C) small southern towns
(D) Midwestern farms
EXPLANATIONS BELOW
Concept note-1: -However, the end of World War II brought about a new social phenomenon known as the suburbs. These residential communities were sought out by many city residents because they wanted to escape their crowded neighborhoods and find lower cost of land and housing.
Concept note-2: -Racial fears, affordable housing, and the desire to leave decaying cities were all factors that prompted many white Americans to flee to suburbia.
Concept note-3: -Mass migration to suburban areas was a defining feature of American life after 1945. Before World War II, just 13% of Americans lived in suburbs. By 2010, however, suburbia was home to more than half of the U.S. population.
Concept note-4: -Suburbs first emerged on a large scale in the 19th and 20th centuries as a result of improved rail and road transport, which led to an increase in commuting.