The correct option is B Security Council
The Security Council has fifteen members. Out of these, five countries, the United States of America, Britain, Russia, China and France, are permanent members. The permanent members have the power to reject and block decisions taken by other members. This is called the Veto power. It aims to solve disputes between nations diplomatically, as well as maintain the peace and security of the world. For any decision to be taken in the United Nations, it is important to have the assent of the five permanent members.