Final answer:
The challenge that is NOT presented by the product life cycle is 'It is difficult to plot the stages as a product goes through them.' This is more of an analytical difficulty rather than a challenge of the product life cycle itself.
Step-by-step explanation:
The question is asking which option is NOT a challenge presented by the product life cycle that a firm must face. Out of the given options:
- All products eventually decline.
- Changing tastes, technologies, and competition affect the marketing of the product as it passes through life-cycle stages.
- A firm must be good at developing new products to replace aging ones.
- A firm must be good at adapting its marketing strategies.
- It is difficult to plot the stages as a product goes through them.
The correct answer is 'E' It is difficult to plot the stages as a product goes through them. This is not inherently a challenge of the product life cycle itself but rather an analytical challenge that can vary depending on methodology and data.