it's (b) yes and I'd say "Have they visited Paris yet?"
25 กรกฎาคม 2014
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Depending on context, a, b and c could all be correct. If you do not have a context, and it is just an isolated sentence, I would go for b.
25 กรกฎาคม 2014
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(b) is correct English and is phrased naturally.
I believe that (a) is perfectly correct English, and the word ordering is perfectly acceptable--but unusual.
If it were a multiple-choice question on a test, I would pick (b) without hesitation.
26 กรกฎาคม 2014
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it's (b) yes and I'd say "Have they visited Paris yet?"
25 กรกฎาคม 2014
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I'm happy to help you work on it. :) I will tell you it's not "a". Which answer do you think might be correct?