The correct option is A The UN security council
The Security Council has primary responsibility under the Charter for maintaining peace and security. It can be convened at any time, whenever peace is threatened. Member States are obligated to carry out its decisions. When a threat to peace is brought before the Council, it usually first asks the parties to reach agreement by peaceful means. If fighting breaks out, the Council tries to secure a ceasefire. It may then send peacekeeping missions to troubled areas or call for economic sanctions and embargoes to restore peace.