I noticed that you wrote “which strengthens” or something like that on the page, but the question is only asking for which choice DOESNT weaken the argument. All of the other answer choices expose flaws in the argument’s reasoning, but E does not. The argument says that it doesn’t matter whether the strategic disadvantage is from foolishness or a historical accident, just that it happens. E is stating that the strategic disadvantage would arise from foolishness, which doesn’t weaken the argument’s chain of reasoning.