The correct options are: B - C
The Roman Republic was a period in the history of Rome characterized by the republican regime as a form of state, which extends from 509 a. C., when it ended the Roman Monarchy with the expulsion of the last king, Lucio Tarquinio el Soberbio, until 27 a. C., date in which the Roman Empire had its beginning.
After the fall of the monarchy the Republic was established in Rome, an aristocratic regime led by some forty gens; the patricians, the descendants of the oldest families in Rome held the power. The main institutions of the new regime were the Senate, the magistracies and the elections.
The Senate was one of the pillars of the Republic, being the political organ that demanded responsibilities to the consuls. Originally the Senate was constituted only by patricians, but from the Lex Ovinia of the year 312 a. C., plebeians were allowed to be part of it. The auctoritas of the Senate gave validity to the agreements taken in the popular assemblies. The Senate also resolved cases of interregnum, a situation that occurred when one of the consuls died.
The Magistracy was an original charge of the Republic. The head of the rex or monarch was replaced by two collegiate and temporary magistrates called consuls who could be held responsible for their government duties. Each magistrate could veto the other, which was known as intercessio.
Also during the Republic popular assemblies, called Comitia Centuriata, were created.
