The process by which certain group members motivate and guide the group is called

leadership

Leadership is both an investigation field and a practical experience incorporating the experience of a person or group to "protect" or supervise other people, organizations, or entire institutions. Leaders help in administration, motivation, and leadership, good leaders display endurance, enthusiasm, determination, commitment, and enthusiasm. They sustain the energies and capabilities of their people and formulate teams allocated to accomplishing well-known goals.

answer is b.shrapnel