The . . . . . . . . leadership theory of . . . . . . . . describes that effective group performance depends on the proper between the leader's style, if interacting with his subordinates and the degree to which the situation gives control and influence to the leader.

A. Lowa State Leadership Studies, Ronald Lippitt and Ralph K. White

B. Managerial Grid, Blake and Mouton

C. Trait Theory, Stodgill and Barnard

D. Contingency Model, Fred Fiedler

Answer: Option D