Perhaps the Critical Key to the Hersey and Blanchard Situational

Perhaps the critical key to the Hersey and Blanchard situational leadership theory, is that:

A) leader behaviour must change based on one situational factor, the readiness of followers
B) that leader behaviour must remain constant, regardless of the situation
C) there are two continuums, not just one, to describe acceptable limits of leader behaviour
D) none of the given answers.