Translation:Floarea-soarelui este galbenă.
I might be wrong since English is not my native language, but shouldn't it be ”The sunflower is yellow”?
Yes, ”The sunflower is yellow” is much more natural than just ”sunflower is yellow.”
especially if DL insists on using the definite article in the Romanian translation... :(
Why can't I use "e" instead of "este"?
You could. I guess they only have forgot to add it as an alternative solution.
Report it, you should be able to use it!