Explanation:

Correct Option 1: ACBD

Explanation

A. When faced with uncertainty, humans look out for the action of others and become a victim of ineffective rational thinking during compelling, confusing situations.
(Introduces the general human behavior in uncertain situations.)

C. Robert B. Cialdini explains this reaction with a psychological phenomenon called 'pluralistic ignorance'.
(Introduces the expert and the term that explains the behavior mentioned in A.)

B. According to him, in an emergency, we tend to forget that everybody else observing the event is also likely to be looking out for social evidence.
(Further elaborates on what Cialdini said.)

D. Since we all prefer to appear poised and unflustered among others, we are likely to search for answers placidly, with brief, camouflaged glances at those around us.
(Provides more detail about our behavior and connects to the idea in B.)