A: No, none of the regular four Surprises can stop you from being Plundered, though you could stop someone from playing the Plunder Rule initially with Avast! (Veto!) you couldn’t do anything about it once it’s been in play for a while. Note that Plunder analogues include City of Thieves (Fantasy Fluxx, Adventure Time Fluxx), Crime Happens (Batman Fluxx), and Acquisition (Star Trek: TNG Fluxx, DS9 Fluxx).
There is, however a pirate-themed promo card we produced called Skullduggery, which does exactly that: it can stop a Plunder.
See also: Can you use the Skullduggery promo…