Who are individuals that do not join the mob but enjoy the excitement and may shout encouragement?

The correct choice identifies individuals who observe a mob activity while not participating directly, yet still engage emotionally with the event. This group, often termed as supportive persons, revels in the energy and excitement of the situation, offering encouragement to those involved without taking any risks or encountering the dangers that actively participating might entail.

This role is significant as it highlights the dynamics of social influence, where even those who do not join the mob can impact the environment and escalate the situation through their reactions and vocal support. Such supportive individuals might create a more charged atmosphere, amplifying the overall intensity of the scene.

In contrast, individuals known as resisters actively oppose the mob's actions and might discourage participation. Yielders may join the mob under social pressure, surrendering to the group's influence, while sideliners remain completely passive observers without offering any encouragement or support, making supportive persons distinct in their engagement with the mob mentality.