How did the migration of the Bantu lead to the rise of east Africa city states

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.

answer; human capital;

answer; blank(1); /// the sea; blank (2); / a forest of pines;