C. Supportive model

Explanation: The correct answer is C. Supportive model.

The supportive model of management emphasizes leadership and its role in motivating employees, rather than relying primarily on monetary incentives. Key aspects of the supportive model include:

1. It focuses on employee support and development rather than control.
2. Leaders aim to create a work environment that helps employees grow and achieve.
3. It recognizes that employees are motivated by more than just money, including recognition, achievement, and personal growth.
4. The model emphasizes participative leadership and open communication.

The other options do not align with the given statement: A. Autocratic model focuses on power and authority, not leadership motivation. B. Custodial model emphasizes economic rewards and benefits, relying more on the “power of money”. D. Collegial model focuses on partnership and shared responsibility, which is close but not as directly related to leadership motivation as the supportive model. E. Collective bargaining is a negotiation process between management and unions, not a management model.