(A) Disarmament
(B) ** Collective Security
(C) Military support
(D) Economic sanctions
EXPLANATIONS BELOW
Concept note-1: -Article 10. The Members of the League undertake to respect and preserve as against external aggression the territorial integrity and existing political independence of all Members of the League.
Concept note-2: -The concept of collective security replaces the one of military alliances between States, which prevailed until World War II, to ensure the collective defense of a State by its allies in case of aggression by another State. Collective security refers to a system put in place by the United Nations Charter in 1945.
Concept note-3: -collective security, system by which states have attempted to prevent or stop wars. Under a collective security arrangement, an aggressor against any one state is considered an aggressor against all other states, which act together to repel the aggressor.
Concept note-4: -By establishing a bond of solidarity between Member States, the League is considered the first attempt to build a system of collective security. This principle relied on a simple idea: an aggressor against any Member State should be considered an aggressor against all the other Member States.