Spent half an hour looking at this problem, but I can't see anyway to get any of the multiple choice answers:

All I know is that it should have something to do with:Originally Posted byAQA Specimen Paper

$\displaystyle F = m \omega^2 r = m \frac{v^2}{r} = BQv \: , \: \omega = \frac{2 \pi}{T} $

Thanks

Edit: Oh and the answer isD