Answer : Both work
Explanation : When you are citing you can both or you can use one, when you are done you can run it through grammarly.
Through careful diction and sentence structure.
It would be c ..... i hopes this helps
I find it easier to start with comparative:
+er: widelier (y turns into i for spelling reasons)
and now superlative :
+est: wideliest (y again turns into i for spelling reasons)
it's a rare word, i admit I don't see it too often.
