Use the word at the top of the list. In most cases the words in the list are not there to select from, but most often show how the word can be used in alternate contexts, where only the top word corresponds to the current usage. In rare cases, any of the shown words can be used. Very rare.
If you are certain your answers in Spanish are correct, you should report them. You will receive a thank you in email for doing that if you are the first person to report something that should be changed. I have done this many times and have a large number of thanks yous. I have also reported a number of things which I later relalized I was off base about. That's okay, as Duolingo ignores reports like that.