Which of the following is a disadvantage associated with conformity?

A) Group process
B) Cognitive dissonance
C) Groupthink
D) Hidden agenda

Conformity can lead to groupthink, which is a phenomenon where individuals within a group feel pressure to conform and suppress their own opinions, leading to flawed decision making. This can be a significant disadvantage in situations where critical thinking and diverse perspectives are needed for optimal outcomes. Group process, cognitive dissonance, and hidden agendas can also be disadvantages associated with conformity, but they are not as directly linked to negative decision-making outcomes as groupthink.