Involves thoughts of death by suicide, thinking about or planning suicide, or making a suicide attempt.

The right answer is suicidal ideation. They are the thoughts that people experience about ending their lives. These thoughts can be slight ideas without any concrete plan or elaborate and concrete plans about ending life in the shortest time. Suicidal ideation does not imply that the person will carry out the plans, however, they represent a risk factor. These thoughts are common in people with a depressive disorder.

I hope my answer can help you.