Answer: Option D
Separate : forming or viewed as a unit apart or by itself.
Independent : free from outside control; not subject to another's authority.
Secluded : (of a place) not seen or visited by many people; sheltered and private.
Self-governed : (of a region or organization) having the freedom to govern itself or control its own affairs.
Autonomous : having the freedom to act independently.
Synonym of Autonomous is Self-governed