increase(s) the risk for being suicidal.

Depressive thoughts are strongly associated with an increased risk of suicidal thoughts and behavior, so A, “Depressive thoughts,” is the best answer. Failing an exam or arguing with peers can be upsetting, but those events alone are not as direct an indicator of suicide risk. Having depressive thoughts does not mean someone will attempt suicide, but it is important to seek support if they occur.

AI-written and checked against the verified answer.