What Was the Military-Industrial Complex That U

What was the military-industrial complex that U.S.President Dwight Eisenhower warned about?

A) A geographical concentration of weapons productions facilities that made the facilities vulnerable to attack
B) The collusion between military leaders and weapons builders that promoted a more aggressive foreign policy
C) The difficulty of demobilizing the military effort at the end of World War II
D) A secret weapons manufacturing plant in the closed Soviet city of Magadan