I see the point why B) is wrong but somehow not convinced with the option D) either.
For instance if we negate E, we get "Moths that are best able to blend in with their habitats might not possess an evolutionary advantage.". Now, this doesn't destroy the conclusion "The change in wing color must be attributable to the soot of the industrial revolution.".
For instance if we negate E, we get "Moths that are best able to blend in with their habitats might not possess an evolutionary advantage.". Now, this doesn't destroy the conclusion "The change in wing color must be attributable to the soot of the industrial revolution.".