Success is achieved by the degree to which society is prepared to police itself.

Answer: Option C

Oppress : keep (someone) in subjection and hardship, especially by the unjust exercise of authority.
Perform : carry out, accomplish, or fulfil (an action, task, or function).
Control : the restriction of an activity, tendency, or phenomenon.
Suppress : forcibly put an end to.
Police : (of a police force) have the duty of maintaining law and order in or at (an area or event).

Synonym of Police is Control