Slaves were very important in ancient Egypt as a big part of the labor force, but they were also used for ... It is believed that these slaves were treated almost as well as the higher ranking Egyptians.
Answer:
the percentage of death occurred in a given country or community
The answer for your question is C. Olmec. Hope that helps you and welcome for the help!
Based on the description, I think the study would be in: cultural psychology
Cultural psychology studies the relationship between a person's behavior and the cultural value around that person.
Since cultural values vary from one place with another, The conclusion that Dr. Joseph got from American culture, could be very different if it tested in another culture.