The correct plural form of "El helado sabroso" is "Los helados sabrosos."
Here's a breakdown of the options you provided:
- El helados sabroses - Incorrect
- El heladoses sabroso - Incorrect
- Las gelato sabroses - Incorrect (Also uses the wrong word, as "gelato" is Italian)
- Los helados sabrosos - Correct
So the proper plural is Los helados sabrosos.