During the Final, Winner-Take-All Game 7 of the Hockey Playoff

During the final, winner-take-all Game 7 of the hockey playoff series between the Ottawa Senators and the Pittsburgh Penguins, a Pittsburgh player violently slashes Ottawa's team captain. In retaliation, one of the Ottawa players skates full-speed right into the Pittsburgh goalie, knocking him over and leaving him with a concussion. After this, fights break out between most members of both teams.
-Eventually,only one player from each team is on the ice and not fighting another player.If they look at each other and decide not to fight,which of the following is the most likely cause

A) Unanimity
B) Personality
C) Group size
D) Ambiguity