Affirmative response

[Guillermo]

Test No. incompl/elem-36 "Question Tags (2)", question 6

Sarah: 'I would prefer to go by air.'
Paul: '.........'

(a) Oh you would, would you?
(b) Oh you did, did you?
(c) Oh you prefer, don't you?
(d) Oh, you wouldn't will you?

Test No. incompl/elem-36 "Question Tags (2)", answer 6

Sarah: 'I would prefer to go by air.'
Paul: 'Oh you would, would you?'

Correct answer: (a) Oh you would, would you?
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I would have thought that the right answer should be: Oh you would, wouldn't you?

[Alan]

No, the idea expressed here is an affirmative response.This is where you repeat the affirmative as a way of showing surprise or even sarcasm.
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English as a Second Language
You can read my ESL story Word Story: Weather