Which of the Following Is NOT a Challenge Presented by the Product

Which of the following is NOT a challenge presented by the product life cycle that a firm must face?

A) All products eventually decline.
B) Changing tastes, technologies, and competition affect the marketing of the product as it passes through life-cycle stages.
C) A firm must be good at developing new products to replace aging ones.
D) A firm must be good at adapting its marketing strategies.
E) It is difficult to plot the stages as a product goes through them.