We've just played a game of Fluxx, where the following occurred. There was a Draw3 and a Poor Bonus in play, so this player got to draw 4 cards. He then removed the Poor Bonus and changed the Draw3 to Draw4.
Option A: Since he raised the number of drawn cards, he needed to draw an extra.
Option B: Since the resulting rules require 4 drawn cards and he already had drawn that many he did not need to draw another.
So which one is it?