Which important legacy did the roman republic's tributes provide for future civilizations?

a. they established that two plebeians selected by patricians could effectively manage the daily affairs of the government.
b. they showed that the common people could elect their own representatives to protect their interests.
c. they demonstrated that plebeian dictators chosen by patricians could successfully lead the republic's armies.
d. they proved that common people working in the senate could compile roman laws, such as the twelve tables.