Fiedler's Contingency Model of Leadership Has Made an Important and Lasting

Fiedler's contingency model of leadership has made an important and lasting contribution to the study of leadership because it:

A) suggests that leaders tend to rely mainly on one style that is most consistent with their personality and values.
B) discovered that effective leaders do not have a common set of competencies.
C) is the only theory to adopt the implicit leadership perspective.
D) is the only leadership theory to adopt a contingency approach.
E) was the first theory to recognize the existence of leadership substitutes.