-1

I have a sentence:

It can be derived from either A or B.

But I’m not sure how to ask the following question:

Which one of them can it be derived from?

Is that ok, or would it be better if it were like this:

From which one of them can it be derived?

2

Prohibitions against ending sentences and clauses with prepositions exist in Latin, but aren't really sensible in English. Either of those forms is correct, though personally I would like dropping the word "one" from either.

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