Which branch of law is created by federal and state administrative agencies?

Administrative law is the correct answer because it encompasses the rules and regulations enacted by federal and state administrative agencies. These agencies are established by legislatures to implement and enforce specific statutes that govern various sectors, such as environmental protection, labor relations, and health care. Administrative law provides the framework within which these agencies operate, detailing how they create regulations, the procedures they must follow, and how they enforce their rules.

In contrast, criminal law deals with offenses against the state or public, civil law pertains to the rights of individuals and the legal responsibilities in conflicts between them, and international law governs relations between countries and international entities. Each of these branches serves distinct purposes and is governed by different principles and regulations, making administrative law unique to the functioning of government agencies and their authority.