I will opt for number three.
1.If you kill yourself you cease to exist, so the question also ceases to have any meaning.
2. As an Existentialist I believe that I am ultimately a free person in that I am responsible for my own actions, however circumscribed my limits physically.
3. The belief that one is a " being-thing" or having a fixed existence is a refusal to admit that one is in a constant state of change, and moving towards the future that one lacks here and now. The future is arriving constantly, so we end up being buffeted back and forth while holding the belief that we are at the mercy of events. This is a refusal to accept responsibility for our actions, as even refusing to choose, is in itself a choice.
As such it is a retreat into "bad faith", and a failure to live an authentic life that we ourselves give meaning to.
Karen.