During the 1950s, Which of the Following Is/are Among the Observations

During the 1950s, which of the following is/are among the observations of students of the city about the suburbs?

A) As the middle and upper classes moved to the suburbs, the city would be deprived of its traditional leadership.
B) The problems of poverty and racism would be reduced substantially by suburbanization.
C) The movement of the middle class to the suburbs would enhance the city's tax base.
D) none of the above