According to the situational leadership theory, if followers are unable and willing to do a task, then a leader needs to

Display high task and relationship orientation to compensate for the follower's lack of ability  

Explanation:

Situational leadership theory: It is a theory when a leader develops a different leadership style. They accept this style according to the situation and the development of the team. It is the best leadership style in which a team leader takes care of the needs of the team members and maintains a balance between organization and members.  

Situational leadership is well known in the organizational psychology developed by Blanchard.  

There are two basic levels of the behavior in this leadership style such as