"There are large scarves."
Translation:Il y a de grandes écharpes.
See the following for a good explanation:
So when entering freeform text, "Il y a de écharpes grandes" is wrong. However, the "correct" form is given as:
You used the wrong word. Il y a des écharpes larges.
This is impossible to enter as a correct answer, as the word bank does not contain either "des" (just de) or "larges" (just "grande" and "grandes")