I think Kay Pam's point is that, if the field is 'artificially' balanced by assuming that ASDA = TODA and there is extra ASDA available, then a solution would be to discard the 'balanced' solution and work out a FLL TOM and V1 for the real field lengths. As the effect of increasing ASDA is to increase both the FLL TOM and V1 it may be possible to either (i) use the new V1 at a higher TOM without modification if it is naturally greater than VMCG or (ii) choose a high V1 within the acceptable range so that it is equal or greater than VMCG if the aircraft is intended to operate at the 'balanced' FLL TOM. If either of those were possible then A becomes the correct answer. As Keith says there is not enough information in the question to say whether there is additional ASDA or not, or what the intended TOM might be.