Which were the three parts of the new roman republic?

In very general terms, the government of the Roman Republic was made up of these three parts: The Senate - Members in the Senate were often members of the richest and most powerful families in Rome. Terms were lifetime and they were chosen by the Consuls. The Consuls - Two consuls were elected by the Assembly and acted as co-rulers. The Assembly - This is where everyone else fit in, the "common" folk of Rome. Though they did not wield as much power as the Senate, if a Senator wanted to be Consul, he had to convince the Assembly because only they had the power to elect them.

The answer would be a