What defines a street gang?

A street gang is typically defined by its involvement in criminal activities and the connection among its members. The correct answer identifies this by stating that a street gang consists of three or more individuals who engage in criminal activities and may exhibit common signs or leadership.

This definition reflects the organized nature of such groups and their collective purpose in pursuing unlawful goals. The mention of "common signs or leadership" further underscores the cohesive structure that differentiates a street gang from casual associations or social groups.

In contrast, the other options describe entities that do not fit the criminal focus that characterizes gangs. For instance, groups involved in charitable activities or legal businesses lack the criminal context essential to a street gang's identity, while a social club that is not engaged in any criminal actions does not meet the requirement of shared illegal behavior necessary for gang classification.