Agriculture in the American Midwest,Australia,and Argentina Was Prosperous Because

Agriculture in the American Midwest,Australia,and Argentina was prosperous because

A) these areas had large populations that were engaged in farming.
B) farmers in these areas benefited from the mechanization of agricultural production.
C) these regions could produce meat and grain with methods that involved relatively little labor.
D) these areas had ready access to markets superior to those of African and Asian farmers.