Which privilege of the patricians do you think Best enable them to keep power? why?

The privilege of the patricians that enable them to keep power is that "Patricians are the only ones who are judges, interpret laws, and preside over trials."

Explanation:

Unlike Plebians, Patricians are those people who are related in family lines to the first senators. They then gained power which they used to their advantage.

Patricians however, assumed the position of making laws. Hence, the privilege of the patricians that enable them to keep power is that "Patricians are the only ones who are judges, interpret laws, and preside over trials."