Which of the Following Would BEST Illustrate the Use of Prior

Which of the following would BEST illustrate the use of prior research as a source of a research topic

A) a research project developed to test a theory of inter-group conflict
B) a research project that will assess the availability of counseling services to clients in a mental health agency
C) a research project that will evaluate the effectiveness of various methods of reducing prejudice among children
D) a research project that will use a sample of urban minority children to replicate a study that found abuse prevention training to be effective with suburban white children