At the Olympics, "dream teams" have frequently failed to win the gold medal. These teams usually have a number of great players who are, nevertheless, uncomfortable with the prospect of sharing their victory. This is an example of decreasing cohesiveness due to $\_\_\_\_\_.$

a$.$ unpleasant experiences

b$.$ domination by one member

c$.$ disagreement on goals

d$.$ large group size

e$.$ intragroup competition