Which would be consider common knowledge?

Common knowledge refers to information that is widely accepted and known by many people, typically without needing citation. This includes facts such as historical events (e.g., World War II occurred from 1939 to 1945), basic scientific principles (e.g., water freezes at 0°C), and universally recognized cultural references (e.g., Shakespeare wrote "Romeo and Juliet"). It varies by audience and context; what is common knowledge in one field or culture might not be in another.