The best example that explains the most crucial element of each civilization is:
The Roman Republic's senate and assemblies were crucial for decision making. The Inca Empire's administrators helped the king keep order and law in different territories, no matter how large the empire was. The Mayan civilization had city-states that were less centralized than either the Republic or Inca Empire.
This option captures the essence of governance and decision-making in each civilization. The Roman senate and assemblies represented a system of collective decision-making, which was fundamental to the Republic. The Inca administrators' role was essential for maintaining order across a vast empire, and the decentralized nature of Mayan city-states highlights their distinct political structure compared to the more centralized governance of Rome and the Inca.