Why were tribunes of the plebs so powerful in Roman government?

A.
They served as leaders in times of emergency.

B.
They judged important cases.

C.
They protected the name of patricians.

D.
They could veto any law or action of a magistrate.

D. They could veto any law or action of a magistrate. The tribunes of the plebs were elected representatives of the plebeians or common citizens of ancient Rome. They were granted the power of veto, or the ability to block any action taken by a magistrate or other government official that they believed was harmful to the rights and interests of the plebeians. This gave them significant political leverage and made them powerful figures in Roman government.