The correct answer is "An example of specific crimes and punishments for all citizens."
Explanation: Hammurabi's Code is one of the earliest and most complete written legal codes from ancient Mesopotamia, dating back to around 1754 BCE. It established a set of laws that included specific offenses and their corresponding punishments, which influenced future legal systems by introducing the concept of codified law where norms and consequences are clearly defined. This systematic approach to lawmaking helped to promote social order and justice by making the law accessible and known to all citizens, thereby laying the groundwork for later legal codes and the principle of fairness in the legal process.
While the other options have some relevance (e.g., the physical form of the laws or the famous phrase "an eye for an eye"), the lasting impact of Hammurabi's Code lies mainly in its role as a precursor to structured legal systems that enumerate specific laws and penalties.