Which of the following could be a warning sign of suicide?

The indication that giving away valuables and saying goodbyes could be a warning sign of suicide is grounded in understanding human behavior and emotional distress. When someone is experiencing suicidal thoughts or feelings, they may start to prepare for their absence from life, which includes actions like giving away possessions that hold personal significance. This behavior often signifies that the individual may believe they will not be needing these items in the future, suggesting a serious level of emotional pain or hopelessness.

In contrast, the other options reflect actions and states of mind that are generally associated with stability and positive engagement with life. For instance, coping well with stress typically indicates good mental health, while an intense focus on personal achievements can portray someone who is goal-oriented and invested in their future. Similarly, a sudden interest in community activities often suggests a desire to connect and engage with others, which is usually a positive sign. Thus, the behavior of saying goodbyes and giving away items stands out as a significant warning sign that should not be overlooked.