The text provides a process-oriented model that suggests six distinct stages at which managers can make decisions

The answer is management recognition of need for change.

b>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Management recognition of need for change is most important, otherwise manager can not adopt the change situation.

I agree   ,,A ,, . diagnosis of problem.

B..................................... Agreed with experts

All answered people are right. No comments

>>>>>>>>>>>  b. management recognition of need for change. >>>>>>>>>>>

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b. management recognition of need for change. ....................... . . .. . 

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The answer is : Option ( B )