What does "common law" rely on for its evolution?

"Common law" relies on customs and judicial decisions for its evolution, making this the correct answer. The foundation of common law is based on the principle of precedent, where the outcomes of previous court cases influence the decisions in new cases. This creates a body of law that evolves over time as judges interpret and apply legal principles to different situations.

Furthermore, customs play a significant role as they reflect the established practices and societal norms that have been accepted over time. This relationship between judicial rulings and societal customs allows common law to adapt to changing societal values and needs, making it a dynamic legal system.

The other choices do not accurately capture the essence of common law. While state legislation plays an important role in the legal landscape, it is not the primary source of common law, which is fundamentally derived from case law and customs. International legal agreements and recent regulatory codes also do not pertain specifically to the evolution of common law, which is distinct from statutory frameworks and international law.