Which one is in the central Italy

A．the history of Rome in this period was marked with internal conflicts
B．Rome was invincible in this period
C．Gauls ended the prosperity of Rome
D．some Etruscan cities were frightened by Rome's victory

A．It was difficult for the chief magistrate to become a dictator
B．Any Roman had the chance to become the magistrate
C．The plebs couldn't hold the post of magistrate
D．Magistrate's power was limited