Assertion (A) A company's positioning and differentiation strategy must change over the product life cycle.
Reason (R) A company's product, market and competitors change over the product life cycle.

A. (A) is correct, but (R) is incorrect

B. (A) is incorrect, but (R) is correct

C. Both (A) and (R) are correct, but (R) is not the right explanation of (A)

D. Both (A) and (R) are correct and (R) is the right explanation of (A)

Answer: Option D