Given the Historical Victories of the Pro-Choice Movement,why Can Success

Given the historical victories of the pro-choice movement,why can success be a setback over the long term?

A) They are not victories because true victories have to be accomplished in stages so as to foil the opposition.
B) They are poorly adapted for compromise and so such victories do not last or result in counterproductive outcomes.
C) There is no success in governmental fiat.It must be achieved collectively,with supermajorities.
D) Victories that are sweeping in nature can inspire countermovements.