In her study of psychopathology and mass murder, Souza found that most of these have a history of mental illness.

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The study specifically focuses on psychopathology and mass murder, indicating that the group being studied are mass murderers. The finding is that most of them have a history of mental illness. The other options (serial killers, murderers, and criminals) were not mentioned in the study and there is no information to suggest that most of them have a history of mental illness.

In Her Study of Psychopathology and Mass Murder, Souza Found