We are asked to explain the contradiction:
* Cafeteria removes corn-syrup sodas → expected soda consumption to drop.
* Survey shows soda consumption rose 15%.
We need a reason why consumption increased despite the cafeteria’s action.
Option analysis:
A. Billboard ads.
→ Could increase interest in soda in general, but not specific to the timing/location. Weak explanation.
B. Cafeteria offered cane-sugar sodas at a lower price than before.
→ Explains that students switched to the new sodas, possibly buying more overall. Strong explanation.
C. Parents work at soda plant.
→ Unrelated to the increase in soda consumption at school hours.
D. Students can buy sodas from vending machines.
→ Could explain the increase if students bought elsewhere instead, but the passage seems focused on cafeteria’s change affecting **overall school-hour consumption**. Vending machines may already have been an option before.
E. New health program.
→ Would suggest consumption should decrease, not increase.
Correct answer: B