Since there was no concept of private ownership of land in sub-Saharan Africa,
a. All members of the tribe live din complete social equality
b. Slave ownership formed an important aspect of determining personal wealth
c. Social differentiation was based entirely on physical strength and military prowess
d. All land was owned by the chief
Since there was no concept of private ownership of land in sub-Saharan Africa, "b. Slave ownership formed an important aspect of determining personal wealth," since people were able to "outsource" all possible labor.