Final answer:
The similarities between Greek and Roman democracy lie in the involvement of citizens in the governance process, but only the Roman system had a system of elected representatives which aligns with modern representative democracy.
Step-by-step explanation:
When examining the similarities between Greek and Roman democracy, it's important to understand the nuances between their respective democratic systems. The Greek city-state of Athens is known for its practice of direct democracy, wherein eligible citizens, about 15% of the population, could vote directly on laws and government matters. In contrast, ancient Rome developed a form of representative democracy where citizens elected representatives to act on their behalf, which is different from a direct democracy but similar in the sense that it allowed citizen participation in government.
Therefore, the most accurate answer to the question would be: B) Both civilizations had a system of elected representatives. This is because, in essence, the Roman version of democracy with its elected representatives influenced the conception of modern representative democracies, and while Athens practiced a form of direct democracy, it set precedents for citizen involvement in governance, which can also be seen as a precursor to representative systems.