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I think it’s more technically correct as “of whom are you afraid” as you should not end a sentence with a preposition.
Then again, I’m a software engineer so perhaps not.
You can end a sentence in a preposition, and whom isn’t a preposition anyway. It’s a pronoun.
It’s fine to end a sentence with a prepositional or phrasal verb. https://www.grammarly.com/blog/end-sentence-preposition/
