(A) ** Unanimously
(B) By a majority of members
(C) By the permanent members
(D) By the Security Council
EXPLANATIONS BELOW
Concept note-1: -Under the Covenant, decisions of the League could be made only by unanimous vote. This rule applied both to the League’s Council, which had special responsibilities for maintaining peace (the equivalent of the UN’s Security Council), and to the all-member Assembly (the equivalent of the UN’s General Assembly).
Concept note-2: -Except where otherwise expressly provided in this Covenant or by the terms of the present Treaty, decisions at any meeting of the Assembly or of the Council shall require the agreement of all the Members of the League represented at the meeting.
Concept note-3: -The creation of the League of Nations marked a new era of multilateral cooperation. The Covenant bound its Member States to try to settle their disputes peacefully. By joining the League, Member States also renounced secret diplomacy, committed to reduce their armaments, and agreed to comply with international law.
Concept note-4: -The founders of the League of Nations were desperate to avoid a repetition of the horrors of the Great War. The main aims of the organisation included disarmament, preventing war through collective security, settling disputes between countries through negotiation and diplomacy, and improving global welfare.