The correct option is D
Federalism is a political doctrine that seeks a political entity or organization is formed by organisms (states, associations, groups, unions, etc.) that are associated delegating some freedoms or powers to another higher body, to whom the sovereignty belongs (State federated or federation) and that they maintain a certain autonomy, since some competences belong exclusively to them. In other words, it is a political system in which the functions of the government are divided among a group of associated States, first, which then delegate powers to a central federal state.