Which aspect of the United Nations Charter authorizes a collective security response to threats and establishes norms of sovereignty?

• A. Chapter VII authorizes collective response to threats.
• B. Article 2(4) prohibits the use of force except as authorized.
• C. The Preamble sets out the purposes and principles of the UN.
• D. Article 51 recognizes the inherent right of individual or collective self-defense.

Answer: (A)