My GBP 0.02;
Answer A.
If by 'correcting it' they mean increasing V1 to be >= Vmcg.
As previously mentioned, whilst balanced field does mean ASDA=TODA, it does not necessarily mean that you are field length limited. Nor does the question state or imply you are FLL either.
With this in mind, if you increase V1, you will increase your ASDR. If you then loose an engine at an increased V1, you have spent longer accelerating on 2 engines. This will reduce your TODR. Hence answer A.
If you 'correct it' by reducing Vmcg by reducing thrust then I *think* A still applies. My head hurts though.
On a side note, there seems to be a bit of chat about the effect of TOW on V1. I seem to remember that this depends on whether you are FLL on ASDA or TODA.
V1 increases with TOW if you are TODA limited as you need to accelerate on 2 engines for longer if you are heavier.
V1 decreases as TOW increases if you are ADSA limited as you now need longer to stop.
Disclaimer
This is all off the top of my head with no access to my Bristol stuff. I could be very wrong.
EK