What is not true from the Cola Wars case?

a. The substitutes can be different depending on how you define the cola industry.

b. The Porter's 5-forces framework is helpful in understanding the cola industry even though the industry may change over time.

c. Coca-Cola and Pepsi have always owned their bottling processes.

d. In the year around 2000, Americans drank carbonated soft drinks more than any other beverage.