Final answer:
Lewis Henry Morgan believed human societies evolved through three stages: savagery, barbarism, and civilization, with technology as the main driver of cultural evolution.
Step-by-step explanation:
The three stages that Lewis Henry Morgan believed human societies evolved through are c) savagery, barbarism, and civilization. Morgan, an American anthropologist, elaborated on earlier evolutionary models by focusing on technology as the driver of cultural evolution. Advanced technology led to new social practices and thoughts, marking the progression from one stage to the next. During the stage of savagery, humans primarily engaged in hunting and gathering. As societies evolved, they entered the barbarism stage, characterized by the development of agriculture, the establishment of sedentary cultures, and advancements such as writing and governments. The final stage, civilization, was marked by even more complex societal structures, trade, and the rise of cities and states. Unilineal cultural evolution, the idea that all cultures pass through these stages in a fixed sequence, has been refuted by later anthropologists, but Morgan's framework remains a significant historical concept for understanding cultural evolution.