After a group of gang members learned that their friend had died in a seemingly random accident, several of the friends started blaming a rival gang for the death. even though there was no evidence whatsoever that the death had been intentional, the more the gang members talked, the more passionate they became in their belief that an act of revenge was necessary. what concept from social psychology may contribute to an act of violent revenge in this case?
a) social influence
b) prosocial behavior
c) altruism
d) groupthink

D) groupthink

Explanation:

Groupthink refers to a situation in which a group of people come together and  make decision without thinking of the effect or outcome. People in the group collectively reach general agreement by giving optimum importance to the opinion and view of the group instead of individual’s opinion and view. It usually happens when groups have limited time to make decision and as a result they resolve to general opinion of the group. Thus, this is done in order to keep the unity and peace of the group.

can you explain it better

they encountered severe weather for which they were poorly prepared.