Who invented the term groupthink?

W. E. B. Du Bois was a prominent sociologist and civil rights activist known for his work on race and social justice issues. While influential in social theory, he did not contribute to the concept of groupthink, as his focus was primarily on racial dynamics and the African American experience rather than group decision-making processes.

Solomon Asch was a psychologist famous for his experiments on conformity, which demonstrated how individuals often yield to group pressure. Although his work is related to the concept of group dynamics, he did not coin the term "groupthink" and thus does not hold the correct association with the concept.

Robert K. Merton was a sociologist known for his theories on social structure and the role of individuals within society. While he made significant contributions to sociology, he did not invent or define the term groupthink, which is specifically attributed to Janis's analysis of group behavior.