Researchers Generally Agree That a ""Group Emotion"" Process Is Unfolding

Researchers generally agree that a ""group emotion"" process is unfolding when what occurs?

A) Members of a group experience a highly homogeneous emotion state
B) One member of the group can be identified by the group as the ""instigator"" of the group emotion
C) After one emotion spreads throughout the group, a second reactionary emotion must spread as well
D) When an emotion occurs without any subsequent collective action
E) All of the above are necessary for a situation to be an instance of a group emotion