…………Concept of Three Major Stages of Social Evolution (Savagery, Barbarism

………….concept of three major stages of social evolution (savagery, barbarism, and civilization) can be divided by technological milestones, such as fire, the bow, and pottery in the savage era, domestication of animals, agriculture, and metalworking in the barbarian era and the alphabet and writing in the civilization era.

A) Morgan's
B) George B.Selden's
C) Michael Tiemann's
D) Eric S. Raymond's