Critical Reasoning

The snack food market has recently seen an explosion in the production and sales of "100- Calorie packs," individually wrapped portions of snack foods sized to provide exactly 100 calories per portion. These packs cost substantially more per ounce-they sell for nearly same price as traditionally sized portions, which are typically two to three times their size - but consumers have been purchasing them with greater and greater frequency. One possible explanation is convenience: Consumers may be relatively unconcerned with their subjective impression of the small packs, and willing to pay more to avoid having to measure out their portions. Another possible explanation is that 100- calorie pack, at least in the case of snacks for which it has sold well, represents the smallest portion that still looks and feels "substantial" enough to appeal to dieters who lack the self control to limit their consumption of snacks from larger packages.
Which of the following, if true, would support one of the given explanation and undermine the other?
A. Consumers are willing to pay exactly the same price for 100-calorie packs sold in vending machine as for traditionally sized snack portions sold in vending machine.
B. A large number of buyers of 100-calorie packs consume them as light desserts after large meals that have left them feeling too full for traditionally sized snack food.
C. Although the 100-calorie packs have begun to sell well across a large variety of demographics, busy young professionals were the first group to purchase them frequently.
D. Because the 100-calorie packs require more packaging per ounce of food than the traditionally sized portions do, manufacturers must charge more per ounce to make the same relative profit as on traditionally sized portions.
E. Sales of 100-calorie packs have been uniformly poor at stores where they are displayed alongside traditionally sized portions, even for the same snacks whose 100-calorie packs are bestsellers at other stores.
OA is E...