Option B: From these options, B sounds most appropriate. The notice is regarding a talk on career options, hence 'Choose Your Career' gives an idea of what the notice is going to be about. So, option B is correct.
Option A: This heading sounds vague, as one cannot 'talk to their career'. 'Career' is an abstract noun and cannot be spoken to. Also, the talk is 'about' career and it is not directed 'to' the career. Hence A is incorrect.
Option C: This does not give the brief idea behind the notice. The title 'Career and Us' indicates a relation between career and 'us', the school. This relation is neither mentioned, nor implied by the notice. Hence C is incorrect.
Option D is irrelevant to the notice, one cannot be invited for career. (Although, one can be invited for a career talk, and that isn't mentioned.) Hence option D is incorrect.