Translation:The girl, the man, and the woman are eating pizza.
Nobody can see what you wrote, so references to "this" or "my answer" or "the correct answer" are not helpful.
Please copy and paste your entire answer if you have a question why it was not accepted.
Even better, take a screenshot that shows the question and your answer, upload it to a website somewhere (e.g. imgur), and tell us the URL of the image.
Often when I'm told to write what i hear, it says something along the lines of "answer in German" in the answering box, so if you have to translate it too, it would probablt say "answer in English". I agree, though. I would probably default to German in this situation as I haven't had to type out my answer in English yet
Essen stands both for 'are eating' and 'eats' right?
essen is the form used for wir (we) and for sie (they) and can indeed be translated to either "are eating" or "eat" depending on context. (But not to "eats".)
In the absence of context, as in a single sentence to translate, either translation will be accepted.