Desegregating Schools in Northern States Proved to Be Difficult Because

Desegregating schools in northern states proved to be difficult because

A) very few minorities lived in the North.
B) segregation in the North was generally de facto and hard to prove.
C) discrimination in the South was so visible and pervasive that little attention had been given to other parts of the country.
D) there was less tax revenue to fund integration efforts in the North.