What Is "White Flight

What is "white flight?"

A) when whites move from the cities and suburbs into rural areas because of crime
B) when whites move into the South, in response to the movement of African Americans to the North
C) the movement of African Americans to the North to avoid violent whites in the South
D) when whites move from cities to suburbia because of school integration
E) when whites move from rural areas into the suburbs because of lack of infrastructure