Collective behavior refers to a spontaneous, unorganized behavior with a large number of individuals. In collective behavior, individuals do not act independently but rely on each other and influence each other. According to the above definitions, Which of the following are not classified as collective behaviors:. ['In the evening a group of people dressed in uniforms danced hip-hop on the open space.', 'A group of residents snapped up food and mineral water in an earthquake in a country.', 'Recently, some false rumors have spread rapidly on the Internet.', 'Brightly colored dresses became popular this summer.']