Final answer:
A. Demand declines most rapidly in the decline stage of the industry life cycle.
Step-by-step explanation:
Demand declines most rapidly in the decline stage of the industry life cycle.
During the decline stage, the market for a product or service shrinks significantly, resulting in a decrease in demand. This can be due to various factors such as changing consumer preferences, technological advancements, or the introduction of new substitutes.
For example, the decline in demand for traditional cameras and film due to the widespread adoption of digital photography can be seen as a decline stage in the industry life cycle.