What is wrong with in question 4 answering "seulement" - it sound perfectly idiomatic.
The full question is asking users to translate the following in French: I stayed only three days.
If your answer only includes 'only three days' (= seulement trois jours), then it won't be counted as correct as 'I stayed' is missing.
I hope this is helpful.
Bonne journée !
The lesson is about practicing the use of "ne..que". Using "seulement" defeats the purpose.
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