Like most such questions, it is a case of trying to make generalisations into specifics ..
Underlying constraint is that we are looking at WAT-limited conditions.
(a) generally not relevant as "normal" V2 is a minimum. If the original V2 is for an overspeed schedule .. to improve climb weight ... reducing it is not the way to go ..
(b) V1 generally not relevant to after takeoff considerations
(c) similar to (b)
(d) generally, climb performance improves at lower flap settings provided that a suitable speed can be used. It is very common for a heavy aircraft to have AFM TO schedules for multiple flap settings. Provided that the runway etc permits the higher speed schedule, the usual outcome is a higher RTOW for the lower flap setting
This sort of question is trying to check whether the candidate has a bit of an idea of what is what ... rather than a detailed understanding.