The Central PMN Was First Formed When

The Central PMN was first formed when:

A) Egypt and Italy began exchanging raw materials
B) The states in Mesopotamia and the Indus River Valley started trading with one another
C) Chicago linked the boat traffic of the Great Lakes with the emerging railroad lines from New York
D) The Egyptian state began making war and alliances with states in Western Asia, connecting the interstate system that had emerged in Mesopotamia directly with Egypt.