I put "C'est le petite déjeuner" as my response but evidently the "e" on the end of petite did me in. I hope the missing "-" did not make it wrong.
"Petit-déjeuner" needs a masculine adjective form AND a hyphen...
Is the question mark really required? This could just as easily be a statement
Or an exclamation with " ! "
The question mark is not required, I did not use it and I got it correct
Duolingo doesn't care about omitted question marks or periods or failure to capitalize