Groupthink is more likely when the group

A) does not have a designated leader.
B) must justify their decision to other groups in the same organisation.
C) is under pressure to make a major decision.
D) experiences any of these things.

Groupthink is more likely when the group is under pressure to make a major decision. The other options may contribute to groupthink, but pressure to make a significant decision is one of the primary factors that can lead to conformity and a lack of critical thinking within a group.