I agree. "Pretty" is accepted for "belle/beaux" elsewhere on this course, so why not here? I am reporting it
Given that "vous êtes beau" and "vous êtes beaux" ont exactly the same pronounciation, It is imposible to know from the audio whether the sentence is singular or plural.
Only by chance can you guess It. So, I think DL should accept both answers or change the record by a new one.
I wrote "you are handsome", which in my view is correct, but was rejected.
Context, my friend; context! Beau/belle means "great" when talking about intensity. Here are some examples courtesy of Larousse--which you probably should bookmark as it will help clarify word meanings so you don't make wrong assumptions:
- je me suis fait une belle bosse - I got a great big bump
- il y a eu un beau scandale - there was a huge scandal
- un bel hypocrite - a real hypocrite