Assertion: When a train accident occurs and a large number of people gather at the accident spot it can be considered a crowd.

Reasoning: The behavior of people in crowds tends to be irrational, and there is typically no independence or coordinated efforts among the individuals.

Assertion (A) is true but Reasoning (R) is not correct.

Groups can indeed be distinguished from other gatherings of people, such as crowds. When an accident occurs on the road and a large number of people gather, it can be considered a crowd. Crowds are characterized by the presence of individuals who happen to be at a particular place or situation by chance. Unlike groups, crowds lack structure and a sense of belongingness among its members. The behavior of people in crowds tends to be irrational, and there is typically no interdependence or coordinated efforts among the individuals.