Which of the following has NOT been proposed as an antecedent condition for groupthink?

A) overconfidence among group members
B) isolation of the group from outsiders
C) lack of pressure to make an accurate decision
D) directive leadership

Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. The antecedent conditions for groupthink include overconfidence among group members, isolation of the group from outsiders, and directive leadership. Lack of pressure to make an accurate decision is not considered an antecedent condition for groupthink; rather, it's the presence of high stress or pressure to conform that contributes to groupthink.