The answer would be the following: <em><u>members of the military , consuls, magistrates and senators.</u></em>
Explanation:
There's not too much explanation needed for this other than sharing than the Roman Empire had a government that was constituted by the military (used to protect the empire); consuls (an annually elected chief magistrates who jointly ruled the republic), senators (who served as an advisory body to Rome's magistrates) and magistrates (elected officials).
Since the population of the cities increased with more factories being built, A seems to be the best choice: More people moved to the city in order to work in the factories.
