It’s an odd question with an odd answer. The distances are far too great to be correct for a line-of-sight VOR and, as a result, the issue of convergency raises its head. If you work out the convergency properly you get 4º, therefore a conversion angle of 2º, so the absolutely correct answer for the great circle track should be 287º. If you ignore convergency, as you normally would, you get 285º. I've no idea why the given correct answer is 286º apart from the horrible suspicion that, once the examiner realised he'd asked a flawed question, he gave a choice half way between the two obvious options.