Answer:
a. Hire Band A
Step-by-step explanation:
Pioneered by the James A. F. Stoner, group polarization theories explain tendency of the people involved in the groups in order to shift their opinions toward extreme pole of the popular opinion at the end of the discussion. In this case, the group is polarized by the strong belief.
Thus, at the end of the discussion, the group will decide the most extreme decision which is the people who are in the favor of hiring the band A. Thus, the most likely decision is hiring band A.