The were the upper-class members of roman society.
a. plebeians
b. etruscans
c. patricians
d. perioeci

The answer is c. patricians.  The patricians were the aristocracy class of Rome. Initially they were the only ones who could hold office as well as formulate the laws.  This angered the commoners or plebeians who rose in revolt. This frightened the patricians that they were grant the right to hold office as well.  Through the creation of the Twelve Tablets of Law, it made it clear that the plebeians now officially had the right to hold office like the patricians.