问题：
A . the general characteristics of minority families
B . culture-related concepts of individual ethnic groups
C . features shared by various cultures or ethnic groups
D . the economic conditions of different types of families
● 参考解析
【解析】第二段第三句和最后一句清楚地表明了“the eric approach”为什么样的研究目的服务。因此，C项为答案。
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