Which Strategy Works Best to Promote Racial Understanding in Classrooms

Which strategy works best to promote racial understanding in classrooms according to research?

A) Placing Black and White students in the same home room for quiet time.
B) Holding mixed race parental discussion groups about racial prejudice.
C) Having students of various races cooperate on a joint, interdependent task.
D) Forcing desegregation where high income schools receive low income students.