Authoritarian leadership is more effective than democratic leadership when:

A) The leader is powerful,the task is well defined and the relations are good.
B) The leader is weak,the task is well defined and the relations are good.
C) The leader is powerful,the task is well defined and the leader is disliked.
D) ​The authoritarian leadership style is never effective. 

Authoritarian leadership can be effective when the leader has a clear sense of power and authority, the task is well-defined and structured, and relationships within the group are positive. In such situations, the authoritarian leader can make quick and decisive decisions without being bogged down by the need to consider multiple opinions and perspectives. However, in situations where the leader is weak, the task is vague or constantly changing, or relationships within the group are strained, an authoritarian leadership style may actually be counterproductive, as it can lead to power struggles, resentment, and decreased motivation and productivity among team members. Option C is also a possibility, but the effectiveness of authoritarian leadership may be limited if the leader is greatly disliked, as this can undermine their ability to maintain control and influence over the group. Option D is incorrect, as there may be situations where an authoritarian leadership style is more effective than a democratic one.