"Dzieci nie znają odpowiedzi."
Translation:The children do not know the answer.
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This particular noun happens to have identical Genitive for singular and plural, which results in both 'answer' and 'answers' being accepted, as there is just no way to tell which one should it be.
In Nominative, the singular is "odpowiedź" and plural is "odpowiedzi". See declension here.
Your answer is correct and listed as accepted, it should have worked. Luckily there is a report that seems to be yours and I'm afraid it starts with "They", not "The".
Even if we really had a mistake/missing answer on our part, I think there are more polite ways to point that out.