单选题：The possible research of family trees is based on the fact

题目内容：
The possible research of family trees is based on the fact that __________. A．genetics has achieved a breakthrough
B．genetic information contained in DNA can be revealed now
C．each individual carries a unique record of who he is and how he is related to others
D．we can use DNA to prove how distant an individual is to a family, a group or a population

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