Main idea in the passage is about: 1. Causes and prevention of mass suicide. 2. Mindset problems of some economists. 3. Contagious nature of human emotion. 4. Behavior is the result of following the herd.
Explanation:
Throughout the passage, the author talks about how their surroundings influence human behaviour, whether through the information believed by the mass or by peer pressure. Mass suicide in Jonestown was only given as an example of people doing something under peer pressure and influence. Thus, A can be rejected. Similarly, the economists' example was also given to make the above point. Thus, B can be rejected. The author says that human behaviour can be contagious. Emotions are not in the scope of this passage. Hence, the answer is option D.
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