Answer: Group think
Step-by-step explanation:
The group think is one of the phenomenon in which the people in the group share their different opinions and point of views and then it results into irrational in the decision making process.
The group isolation and the cohesiveness are the main causes of the group think and making the various types of decisions together in the group.
According to the question, the group think is one of the reason when we felt speaking in the meetings and also in the informal group. Therefore, Group think is the correct answer.