I almost saw this as a conclusion. I guess the language sort of made it feel like a sub-conclusion, or a rephrasing of the conclusion. Ultimately, I did choose the correct answer but I'm happy that now I can learn better sentence parsing!

I honestly felt this was an obvious one. When I read the stim, I immediately sniped the assumption. The clearest assumption is that no qualified teachers would ever relocate to the district. If some DID, that would destroy the argument. I think ya'll are just overthinking it. Believe me, I never get these hard ones right lol