The correct answer is letter D
A centralized government is one that concentrates power and decisions in the hands of a few people, usually the federal sphere (chief executive and ministers) has power and control over state and municipal spheres.
Decision making in an state can be centralized or decentralized. Centralization is the way in which the location of decision making is close to the top of the organization. Decentralization, on the other hand, puts pressure on the lower hierarchical levels to make decisions.
