Final answer:
The role Bob plays in his group is best described as a mediator or facilitator.
Step-by-step explanation:
The role that Bob plays in his group is best described as a mediator or facilitator. As a mediator, Bob helps the group members resolve their conflicts by assisting them in finding solutions and reaching a compromise. He promotes open communication, active listening, and encourages the group to work together towards a resolution. As a facilitator, Bob guides the group through the conflict resolution process, ensuring that everyone's voices are heard and that the group can ultimately accomplish its goals.