What Does It Mean That Kinship,like Race,is Culturally Constructed

What does it mean that kinship,like race,is culturally constructed?

A) The educational system is failing to educate people about real, biologically-based human relatedness.
B) Like race, kinship is a social fiction, with no real social consequence.
C) It is a phenomenon separated from other real aspects of society, such as economics and politics.
D) Studies of kinship tell us little about people's actual experiences, only about what they think those experiences are like.
E) Some genealogical kin are considered to be relatives whereas others are not, and the rules underlying such considerations vary across cultures.