This question has been removed from the JAA question bank as a result of a complaint from Oxford (about 2 years ago!) to the CAA that it was an unreasonable question (and also that the JAA had the wrong answer marked as correct -which happens from time to time!) If your FTO is still putting it out as feedback, their feedback is out of date. This one should never appear in the exams again.
An explanation of the answer is at the following website:
:
http://www.v1rotate.freeuk.com./down...r_Solution.doc .
There was a previous correspondence on pprune about it, which can be found
here