The correct answer is letter B
Collective behavior means relatively spontaneous and unstructured behavior, carried out by a large number of individuals, who react to a certain event, problem or situation.
The most common forms of collective behavior are: crowds, riots, panics, riots, disastrous behaviors, rumors, collective hysteria and fashion fevers. Some of these types of behavior - crowds, riots and disastrous behaviors - involve people who are usually in the presence of others and who are somehow interacting. These are called localized collectivities. Other forms of collective behavior - rumors, collective hysteria, moral panics and fashion fevers - involve people who are not necessarily in the presence of others. They may even be in different countries. However, they share certain beliefs and interests. Some examples of collective behavior are: a crowd that cheers for a team during a football game, a group of people who come together to attend a public speech or the collective interest of people in a newly launched product.