In Goldberg's Research on the Effects of Similarity in Race

In Goldberg's research on the effects of similarity in race and sex on interview assessments and offers,

A) White recruiters preferred White applicants and Black recruiters favored Black applicants.
B) male recruiters preferred male applicants and female recruiters preferred female applicants.
C) White recruiters preferred White applicants but Black recruiters did not favor Black applicants.
D) in-group favoritism was clearly and consistently documented.