Final answer:
The process by which certain group members motivate and guide a group is called leadership.
Step-by-step explanation:
The correct answer is C) Leadership.
Leadership is the process by which certain group members motivate and guide a group. It involves influencing others, setting goals, making decisions, and providing directions. Leadership can take different forms, such as democratic, authoritarian, laissez-faire, or expressive.
In a democratic leadership style, communication flows from the top down, with leaders encouraging group participation in decision-making and consensus building.