Hersey and Blanchard's situational leadership model states that the best leadership style depends on:

A) the readiness of followers.
B) the availability of leadership substitutes.
C) the leader's capacity to walk the talk.
D) the leader's integrity, weight and other traits or competencies.
E) none of these conditions.

According to Hersey and Blanchard's situational leadership model, the best leadership style depends on the readiness of followers. The leader should adjust their leadership style based on the level of readiness of their followers, which is determined by their ability and willingness to perform a specific task or goal. Therefore, the correct choice is A.