The "Anonymity" question should be broken into two. It doesn't give you an option for "It would be easy to find my real name, and I am unhappy about that."

Yes. In my case, the best answer would be: “It would be non-trivial but still relatively easy for someone who doesn't know me in meatspace to find out my full name and my Facebook profile from what I write on LW, but I can't think of why anyone could be bothered to do that and even if it happened it wouldn't bother me in the slightest. It would bother me if certain people who do know me in meatspace read some of the things I write on LW knowing army1987 is me, and it would be nearly obvious for anyone who knows me in meatspace that army1987 is me, but I think it's pretty unlikely for one of those people to stumble upon LW so I'm not too worried.”