Which of the following is not one of the reasons that a company's strategy evolves over time?

A$)$ The need on the part of company managers to make regular strategy adjustments so as to keep rivals off balance and always guessing about what moves it will make next

B$)$ Mounting evidence that the present strategy is not working well

C$)$ The need to keep strategy in step with changing market conditions, advancing technology, and the fresh moves of competitors

D$)$ The need to respond to shifting buyer needs and preferences and emerging market opportunities

E$)$ Ongoing management efforts to fine$-$tune this or that piece of the strategy and to adjust certain strategy elements in response to new learning and unfolding events