Prior to this text, the author has most probably made an analysis of ______.

C
细节理解题。根据题干信息定位到第一段首句“our analysis therefore suggests that the real problem facing the black community lies in the educational obstacles prior to the Ph. D. programs rather than in the pour—in of foreign students”，由句意：我们的分析表明黑人群体所面临的真正问题是接受博士教育之前所遇到的教育障碍，而不是外国留学生的大量涌入，推测作者在写这篇文章之前应该是做了一项关于黑人教育问题的分析，故答案为C项。