Which of the Following Is Not a Good Example of a Substitute

Multiple Choice

Which of the following is not a good example of a substitute product that triggers stronger competitive pressures?

A) artificial sweetener as a substitute for sugar
B) wireless phone service as a substitute for a landline telephone
C) Coca-Cola as a substitute for Pepsi
D) digital cameras as substitutes for film cameras
E) video-on-demand services as a substitute for renting movies from a movie rental store