The appropriate leader style will vary from one set of circumstances to another is the basic assumption of situational approaches to leadership. (Option C)
Situational leadership is modifying your management approach to fit the demands of the team or individual team members in each special circumstance or assignment. The Situational Leadership Theory was developed in 1969 by Paul Hersey and Ken Blanchard. There isn't a leadership style that "suits all," in their opinion.
The foundation of situational theories of leadership is the idea that the best leadership approach varies depending on the circumstance. A leader must be able to modify his style and strategy to fit various situations if he is to be most effective and successful.
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