The option that is NOT a risk factor for depression and/or suicide is:
Being sad for a while after your friend moves away.
While it's normal to feel sadness in response to significant life changes, such as a friend moving away, this temporary feeling does not itself constitute a risk factor for depression or suicide. In contrast, the other options listed (having a close relative with a mood disorder, experiencing or witnessing violence, and having a previous episode of depression) are recognized risk factors.