Which type of law governs the conduct of states and regulates relations among them?

The correct answer is international law, as it specifically pertains to the rules and principles that govern the relations and conduct of sovereign states in their interactions with one another. International law encompasses a broad range of practices, treaties, and conventions that nations must follow to maintain order and cooperation on global issues, including trade, human rights, and environmental protection. It provides a framework for resolving disputes between states and establishes protocols for diplomatic engagement, thus playing a crucial role in international relations.

Common law, civil law, and statutory law are primarily concerned with domestic legal systems and the governance of individual states rather than the interactions between different states or countries. Common law is based on judicial precedents and is practiced in many jurisdictions, while civil law relies on codified statutes and legal frameworks. Statutory law includes laws enacted by a legislative body. While these areas of law are vital for domestic governance, they do not address the international relations and conduct of states that are essential to international law.