Which term describes the behavior of a crowd that is advancing with clear boundaries?

The term that best describes the behavior of a crowd that is advancing with clear boundaries is "Agitated Crowd." An agitated crowd typically exhibits heightened emotional states and can often display a sense of purpose; they may move toward a specific goal or location. This type of crowd is characterized by a level of organization that can be discerned through their collective movement, which indicates that they have a shared intention or motivation. The presence of clear boundaries suggests that while the crowd may be energized or heightened in emotion, it is not simply chaotic or disorganized.

Conversely, a sighting crowd refers to those gathered for observation, often without any shared objective, while a mob suggests a more chaotic, aggressive behavior without clear boundaries or purpose. A casual crowd is generally marked by relaxed interactions and lacks the focus or urgency that defines an agitated crowd. Thus, the distinguishing features of an agitated crowd with defined movement and emotional intensity make it the correct choice for describing the behavior of the advancing crowd in this scenario.