"Soup is tasty food."
Translation:Zupa to smaczne jedzenie.
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"jedzeniem" is not Accusative, it's Instrumental. Accusative is identical to Nominative for this noun (and for other neuter nouns), so it's "jedzenie".
Instrumental of "smaczne jedzenie" is "smacznym jedzeniem". Sentences built as "[noun] is [noun]" (or to be more precise, noun phrase) can use the Instrumental case.
That doesn't mean that in will work in every grammar construction, or even every sentence where it's shown in the hints. The hints are for the whole course.
Nevertheless, here you can answer with "Zupa to smaczne jedzenie" or "Zupa jest smacznym jedzeniem". See here for more info: https://forum.duolingo.com/comment/16373167