Answer:a)Change agent
Step-by-step explanation:Change agent is person in a organization who focuses on the matters of the company and then gives the ideas about changes accordingly to implement it.These change are made because of the reasons like improvement of the company policies and status, development etc.
Change agent usually behaves as a counselor to the organization because he/she makes the plans according to the the problem or need of the company. Agent can be a employee of the organization or an outsider.
Thus, the correct option is option (a).