A Crowed is a temporary gathering of people who are in close enough "proximity to interact". correct option is option (a).
There many types of crowds like casual crowds, conventional crowds and Expressive crowds. Casual Crowd is forms spontaneously when some event captures people's attention. It is the least organized and most temporary type of crowd. There is little interaction. Conventional Crowd is a more structured crowd that acts according to established rules of behavior. Conventional crowds are made-up of people who gather together for a common purpose like a sporting event or religious service. Expressive Crowd are these crowds form around emotionally charged events such as rock concerts, funerals of public figures, and holiday celebrations. Expressive crowds display intense emotion, but generally obey the rules of society and maintain a semblance of order.
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