If the designers and test pilots have done everything correctly then the aircraft should stall first to avoid structural damage.
At Va, full and abrupt control deflection should not lead to any damage, as the aircraft will stall before the forces increase beyond the design limit. So AFAIC the correct answer is "the aircraft will stall".
But is Va the speed:
i) "below which the aircraft will stall, if full and abrupt control inputs are applied, before structural damage will occur." ?
or
ii) "above which structural damage will occur, if full and abrupt control inputs are applied, before the aircraft will stall." ?
Binners93 original Post seems (to me) to be asking how to answer a written theoretical question so "should" or "might" are not very helpful in this context.
In the question posed by Binners93 the aircraft is flying (exactly) at Va.
I believe the definition of Va is i) above, therefore b) would be the correct answer to the question asked.
(especially as "the aircraft will stall" is not given as a possible answer)