Which theory states that the earths lithosphere is divided into moving pieces?

plate tectonics:

Pieces of the lithosphere that move around on top of the Asthenosphere

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

sorghum farming likely spread with the bantu migration. there is your answer i had to get it wrong to get this right so i hope ya'll enjoy!