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Why is the correct answer D? As opposed to E, I can understand that no where in the text does it show that in order for a consumer to purchase the merchandise, they must have the ability to verify any and all claims regarding it. Yet, for choice D, I am having a hard time understanding why there would be a contradiction made.
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Why are you looking for a contradiction?
You'll find support for AC D in the last sentence. If the market was stagnant to begin with and they deterred what customers they did have from purchasing oils then comparative advertisements carry the risk of causing a contraction in the market.