Traditionally, in Order to Be Jewish, a Person Must Have

Traditionally, in order to be Jewish, a person must have a Jewish mother, follow the Jewish religion, and abide by kosher food limitations. Although they are not ironclad, these customs set "traditional" Jewish people apart from others. What concept does this serve to illustrate?

A) ethnic boundary markers
B) ethnic-making projects
C) socially significant traits
D) religious determinism