Which factor does NOT influence leadership?

The correct choice highlights an essential understanding of leadership dynamics. While one might think that the size of the group does play a role in leadership, it does not influence the fundamental nature of leadership itself when compared to other factors.

Leadership is significantly affected by the type of task at hand, as different tasks may require various styles of leadership for effectiveness. For example, a creative project may demand a more democratic or participative leadership style, while a crisis situation might necessitate a more authoritarian approach.

Furthermore, the knowledge and skills within the group directly impact how a leader can effectively guide and make use of the group's capabilities. A leader must adapt their approach based on the competencies of their team to ensure success.

The attitudes of individuals within the group are also pivotal; a leader's effectiveness can hinge on how the group members feel and behave, affecting group cohesion and motivation.

In summary, while group size may have logistical implications, it does not fundamentally alter the core principles of leadership effectiveness as significantly as the nature of the task, the abilities of group members, or the individual attitudes present within the group.