The conclusion of the argument is that killer whale based shows will not be possible in the future since hunting killer whales is banned.
The question is a bit tricky because the way it asks the question. We have to select an option that does not undermine the conclusion. While many such type of except question can be reworded as chose an answer that strenghtens the argument. In this particular case we have to chose an option that does not weaken the conclusion of the argument.
From option A to D all provide circumstances that has us to believe that killer whale shows will continue in the future.
For Option D though not in line with accepted methods, illegal hunting will still facilitate the show in the future.
Option E does not undermine the conclusion by providing details on hunting technique.
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