"The soup is too hot."
Translation:Η σούπα είναι πάρα πολύ ζεστή.
You don't mention what the "other correct" choice was but I'm assuming it was: "παρα πολύ ζεστή" which would have been the correct and only correct choice. This is not the first time we've heard of this confusion and since the "multiple choice" is out of our control we still haven't been able to resolve it. Duo can be bit Jarndyce vs Jarndycian. We'll keep trying.