Answer: Unconscious
Explanation:
According to the consciousness theory of Freud,unconscious level is the stage where a person is unable to figure out things beyond the consciousness. Any thoughts, views, memories, ideas etc that occur without one's conscious awareness are the unconscious level urges.
According to the question,Cartman is experiencing thoughts of killing Kenny in unawareness because it is outside the zone of consciousness.Thus, he is at the stage of unconsciousness according to Freud's theory.