Final answer:
Teenage killers typically show a history of aggression, warning signs, and have little parental supervision, but being a bully is not a common similarity among them. Higher susceptibility to bullying is found among those different from their peers, and research suggests a potential link between violent video games and aggressive behavior.
Step-by-step explanation:
The similarities found among teenage killers typically include a history of aggression, giving warning signs before actions, and little parental supervision. However, it is not characteristic for teenage killers to have been bullies themselves, as implied by the option (a) 'Bullied their peers'. On the contrary, many teenage killers may have been victims of bullying or antisocial behaviors themselves.
When looking at bullying, certain groups are more vulnerable. Children who are different from their peers—whether due to physical disability, sexual orientation, ethnicity, or emotional sensitivity—are more likely to be targeted. Groups such as transgender adolescents or children with a physical disability are at a higher risk of being bullied compared to the captain of a football team, who is likely to hold a higher social status that might protect them from such behaviors.
Research into video game violence suggests a complex relationship between violent content and aggression in real life. It has been suggested that exposure to violent video games can lead to an increase in aggressive thoughts and behaviors. However, the nature of this connection is still being debated, with further research needed to understand the intricacies of how and to what extent media violence might influence real-world aggression.