Concept:The veto power in the United Nations is exercised by the permanent members of the Security Council.
Explanation:The Security Council is responsible for maintaining international peace and security.
It has
15 members, of which
5 are permanent members: the United States, the United Kingdom, France, Russia, and China.
For substantive resolutions to pass, at least
9 affirmative votes are required, including the concurring votes of all
5 permanent members.
Therefore, any permanent member can block a resolution by casting a negative vote, which is known as exercising the veto power.
Answer:D. the Security Council