Ambiguity between american and british english is present here in the spelling of spealised
This is something we are investigating (@gregmat for reference).
Yeah, I wonder if we should include a note on the problems that says something like, “This exercise conforms to American spelling conventions.”
I know the real TOEFL doesn’t do that. Perhaps they structure the exercise in such a way that this never comes up. But at this point we’re not sure, so this seems like a good temporary solution.