If I understand the example in the lesson and these comments correctly, the answer should actually be "Il était une fois, un roi qui vivait dans son château."
If it's a quiz error, please use the "Report it " button in your Correction Board as it will link directly to the said quiz and is easier to fix.
I'll do that, but the last time I used a "Report issue" button to report an incorrect quiz question, the person who responded said "I'm not a French expert; please post a question on the discussion board for the lesson." A bit of a catch-22. (However, I can't remember if I reported it from the quiz or the "Explain this" pop-up page or somewhere else.)
If you come up against something similar in the future, please try the 'Report it' button in your correction board again as this is the procedure I have been given to follow.
Language questions come back to me anyway and there might have been a glitch in the system at that point...
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