When you talk about a person’s , you are referring to the country, race, or social class of their parents or ancestors.
A. origin
B. nationality
C. generation
D. relation
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(答案→)A. origin
B. nationality
C. generation
D. relation
解析：A n.起源，根源；出身；B国籍；C一代人；D关系，联系；教育：当你们在谈论一个人的出身的时候，你们是在谈论他的父母亲或者祖先的国家，种族或者社会地位。根据第二句中的the country, race, or social class of their parents or ancestors可知是对名词origin的内容的解释。故A正确。