When people in his group get into heated disagreements, George helps those in conflict to work out their differences to find an acceptable solution for all concerned. His major role in the group is best described as a(n)

A compromiser

Explanation:

A compromise is defined as an agreement that is reached by different groups of people or individuals in which they get to mutual concessions to work out their differences or to reach a goal.

In this case, when a group is not able to reach a decision or to get to an agreement due to differences of beliefs, for example, they need to compromise. This is the role of George. George, as a compromiser, helps these people to reach an agreement that works out for both parties. This way they come up with a solution to reach a common goal.

Therefore, in this scenario, George is a compromiser.

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