Where is the unanswered option for the spaces?

That does seem a little funny, the way it's working now, but we never liked that feature anyway. In practice it never did any good.

New users trying to gain points would answer years-old debugging Q's, or would cut&paste answers onto old duplicate Qs. Or they wrote answers for a Q where one answer had 10 up votes but wasn't marked as the answer. Just completely unhelpful stuff. Sometimes marketers use unanswered Qs to promote something in the Asset Store, but a topic search is fine for that (since it's fine to put your better answer on an already answered Q.)

The site has also never placed much emphasis on the official answer anyway. We never cared if the most upvoted Q was the green answer. Often the person asking the Q checked some bizarre work-around as the answer, while another one got lots of up votes. That was fine with us. In other words, many answer-checked Qs are really unanswered, and vice-versa.

The real way people answer old Qs is a search, they don't find an answer, solve it themself, then decide to be nice and post their answer to that old Q. Having an "unanswered Qs" section sends the wrong message about what the site is for.