"Who are you?"
Translation:Hvem er du?
So this answer needs to be adjusted. Because how are we suppose to know they were talking about plural people. LOL. I answered du, and was like how is this wrong? Thanks for the explanation though!
EDIT: after rereading, i just read the answers incorrectly, i should have known it was dere in this instance because the answer with "du" was completely wrong anyway.