Man I wished there was a German-Danish Duolingo course (but hey, I'm more than satisfied with this one!). The words are just the same "Ist es vollständig notwendig?" Would make things so easy to remember...
Google search results:
"totally necessary" About 316,000 results
"wholly necessary" About 82,400 results (
"completely necessary" About 477,000 results
QED: "totally necessary" should be allowed as an alternative answer.
I have added them, but using the "Report" button (at the bottom left of the lesson on a browser or the flag on the mobile app) is probably a bit easier to do in the future and saves clutter on the sentence discussions