In an effort to boost sales during the summer months, which are typically the best for soft-drink sales, Foamy Soda lowered its prices.
Given That
Soda sales are usually highest during the summer months, and Foamy Soda lowered its prices in an effort to boost sales.
How Can it Be That
Foamy Soda's sales dropped during the summer months.
Evaluate / Goal
We need to find four different ways to explain Foam's lower sales numbers.
An answer might say that "lower prices" somehow caused lower sales (a contrast between normal price and lower price.
An answer might use a contrast between what happens for typical sodas (good sales during summer) vs. what happens for Foamy (they're different from other sodas in some worse way).
An answer might use a contrast between typical summers (high soda sales) and this summer (bad soda sales for some reason).
But basically we need to know why this summer isn't like typical summers, Foamy isn't like other sodas, lower-price Foamy isn't like regular priced Foamy, or some other mechanism that can explain why Foamy had disappointing sales this summer.
We can preface our reading of every answer choice by saying,