TOEFL Listening: ETS-TOEFL听力机经 - 4RJ5QI0BAOB1ARNDP$

Why does the professor mention a bicycle shop? A. To point out that consumer demand for some items can vary greatly over time B. To emphasize that certain items generate more profit per sale than other items C. To suggest that business owners sometimes have no choice but to lower the price of certain items D. To point out that changing the price of an item can have unexpected consequences