Close, friendly groups usually work well together, but they may face a problem involving an extreme form of conformity called ________.

A) fundamental attribution error
B) groupthink
C) generational identity
D) self-serving bias

Groupthink is a phenomenon where group members tend to conform to the group's opinion or decision, potentially resulting in poor decision-making. This is more likely to occur in close, friendly groups where members want to maintain a good relationship with each other and avoid conflict, resulting in a lack of critical evaluation of alternative options. The other options (fundamental attribution error, generational identity, self-serving bias) do not describe the specific problem faced by close, friendly groups.