Answer:
C. Groupthink
Step-by-step explanation:
Most of us can remember at least once when a group, when making a decision for the sake of beloved harmony, set aside individual ideas and opinions and followed a not very rational path. This kind of dysfunction in decision making, which in English is called groupthink. Groupthink occurs when an environment begins to show overestimation of group power and morality, with thoughts such as "Yes, we are good in every way!"; lack of openness to new ideas, always ignoring or rationalizing any questioning about the falseness of group assumptions and pressure for uniformity. These "symptoms" are similar to what is happening in the group exposed in the question, so we can conclude that the question is describing a situation where groupthink occurs.