Kenneth and Mamie Clark Are Famous for What Series of Studies

Kenneth and Mamie Clark are famous for what series of studies?

A) randomly assigning students from stigmatized groups to take a test under stigmatizing conditions or a control condition
B) inducing fear of acting White in students and investigating their achievement
C) presenting brown and white dolls and asking "Give me the doll that you like best"
D) investigating whether schools in the South held lower standards than schools elsewhere