Which one of the following characteristics observed in a teenage boy should always alert the nurse to the possibility of suicide?

Choice A reason: While the 15 to 19 age range is a period of increased risk for suicide attempts, being in this age group is a demographic fact rather than an individual clinical characteristic that "alerts" a nurse to an imminent or specific possibility of suicide without other accompanying symptoms. Choice B reason: Threatening to cause harm to peers is an indicator of potential violence toward others (homicidal ideation or conduct disorder) rather than self-directed violence. While all threats of harm must be taken seriously, this specifically points toward an externalized aggression rather than an internalized suicidal intent. Choice C reason: Research consistently shows that LGBTQ+ youth face significantly higher rates of suicidal ideation and attempts due to societal stigma, bullying, and lack of support. When combined with a history of depression, this creates a high-risk clinical profile that requires proactive screening and targeted suicide prevention interventions. Choice D reason: A history of torturing or abusing animals is a hallmark of conduct disorder and is often associated with the development of antisocial personality disorder. While it indicates significant psychological pathology and a risk for future interpersonal violence, it is not a classic or specific predictor of suicidal behavior.