Final answer:
The common characteristic shared by both Hysteria and Psychopathic Deviate is a) emotional instability and attention-seeking behavior.
Step-by-step explanation:
The common characteristic shared by both Hysteria and Psychopathic Deviate is A) Emotional instability and attention-seeking behavior. Hysteria is characterized by exaggerated emotions and seeking attention through dramatic behavior. Psychopathic Deviate is characterized by impulsive and reckless behavior as well as a need for stimulation and excitement.