Research That Demonstrated That Black Children Often Preferred Playing with a White

Multiple Choice

 Research that demonstrated that Black children often preferred playing with a White doll than a Black doll was cited in Brown v.Board of Education of Topeka,in which the Supreme Court ruled that segregation of public schools was unconstitutional.Who conducted this research? 

A) Martin Seligman and Ed Diener
B) Kenneth Clark and Mamie Phipps Clark
C) Abraham Maslow and Carl Rogers