When We Say That People in Early Agricultural Societies Tended

When we say that people in early agricultural societies tended to be linked "vertically" rather than "horizontally," we mean that

A) they were organized in groups linked by some form of common allegiance.
B) they were organized in groups ranked with one above the other.
C) they were organized in groups linked by their class in society.
D) they were organized in groups ranked according to political and economic power.