The correct answer is "D".
The Roman Empire was greatly influenced by the Greek's developments during the Hellenistic period. One of the practices they adopted was their political system, establishing the concepts of "democracy" throughout their institutions. However, much of these practices were "direct" democracies in which the people directly influenced the empire's affairs. These models transitioned into "representative" democracies of Republics in which people who were elected by the majority of the population oversaw governmental affairs.