What is the first paragraph mainly about?

What is the first paragraph mainly about?
A、Examples of discriminations.
B、The concept of stereotype threat.
C、dominant theory in sociology.
D、Stressful situations for the stigmatized.
【正确答案】:B
【题目解析】:推理判断题。第一段第三句话中的The effect代表前一句话,而第二句话又是紧扣第一句话的,因此第三句话是对前两句话的概括,而第三句话得出了stereotype threat这一概念,所以,第一段是B选项所指的内容。