company's strategy evolves over time as a consequence of:

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a$)$ the need to keep strategy in step with changing circumstances, market conditions, and changing customer needs and expectations.

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b$)$ the proactive efforts of company managers to fine$-$tune and improve one or more pieces of the strategy.

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$$the need to abandon some strategy features that are no longer working well.

$$the need to respond to the newly initiated actions and competitive moves of rival firms.

on

e$)$ All of these.