Answer:
A 60% chance, B 40%
Explanation:
The interesting thing here is that both A and B are essentially the same. A consequence that is not helpful but doesn't harm anything means you can do as you please without fear. A consequence that does nothing means you can do as you please without fear. This is one of those questions that has an answer defined by the views of the poser. Most likely A is the answer as it implies SOME consequence will occur where no effect can mean nothing happens at all, not quite the same thing but with the same end result: do as you please.
