Which of the following, if true, most strengthens the argument above?

A) All American Burger's policy of posting nutritional information does not extend to new products.
B) All American Burger's competitors often experiment with different recipes offered in limited markets.
C) The Hawaiian Burger sales were higher than the sales of the Slushpile, a new dessert option.
D) The Mexican Burger was the subject of an intense product awareness campaign, but the Hawaiian Burger was not.
E) A rising number of fast food customers insist on having vegetarian menu options.

Answer: D
Explanation: D) Choice D strengthens the argument by suggesting that the Hawaiian Burger won out in spite of the product awareness campaign that only the Mexican Burger had. If the Hawaiian Burger won despite this disadvantage, then it is easier to believe that a taste preference for pineapple is the important factor here. Choice A does not distinguish between the two burgers. If one had nutritional information and the other didn't, then that might be another reason to choose one over the other, but that's not the case with Choice A. Choice B is too general and tells us nothing about All American Burger's experiment. Choice C is off topic. The argument here is about pineapple vs. jalapeno. Dessert options are irrelevant. Choice E is similar to Choice A in that it does not distinguish between the two burgers. If one were vegetarian and the other wasn't, then that might have been a factor behind the sales difference. But we aren't told that, so Choice E neither strengthens nor weakens.