A Company's Strategy Is a "Work in Progress" and Evolves

A company's strategy is a "work in progress" and evolves over time because of:

A) the importance of developing a fresh strategic plan every year (which also has the benefit of keeping employees from becoming bored with executing the same strategy year after year) .
B) the ongoing need to imitate the new strategic moves of the industry leaders.
C) the need to make regular adjustments in the company's strategic vision.
D) the ongoing need of company managers to react and respond to changing market and competitive conditions.
E) the frequent need to modify key elements of the company's business model.