According to Diamond, which of the following factors inhibited the rise of intensive agriculture in sub-Saharan Africa, the Pacific Islands, and the Americas?
In these geographic zones, there were few plants and animals that were amenable to domestication.
In these zones, humans lacked the intellectual capacity for intensive agriculture.
These zones have always been fraught with conflict, preventing the development of new agricultural technologies.
Strict rules of egalitarianism and lack of private property prevented investment in agricultural projects.
