The correct answer is B) checks and balances.
The political structure of the Roman Empire included all of the following from the Roman Republic except "checks and balances."
What the Roman Empire included was a Senate, plebeians and patricians, and imperial provinces.
The ´power of Roman politics was a threefold structure that was later imitated by other nations. A Senate, the election of magistrates, and popular assemblies. The government had two consuls that served one year. They were the heads of the states and had the executive power to preside over the Roman Senate and command the military. The popular assemblies had the legislative authority to create laws and the Senate functioned as the group of advisors to the Consuls and Emperors.