Questions: Deiandra is at a football championship game. After the home team wins the game, she rushes on to the field with a crowd of people who pull down the goalposts, even though she knows this constitutes vandalism. What group behavior does this demonstrate?

The answer is deindividuation.

Social loafing refers to the tendency of individuals to put in less effort when working in a group compared to when working alone. This does not apply to the scenario because Deiandra is actively participating in the group action rather than reducing her effort.

Deindividuation is a psychological state where individuals in a group lose their sense of individual identity and self-awareness, often leading to behavior that they might not typically engage in alone. This is relevant to the scenario as Deiandra, despite knowing that pulling down the goalposts is vandalism, participates in the act due to the influence of the crowd.

Group polarization refers to the tendency of a group to make decisions that are more extreme than the initial inclination of its members. This does not fit the scenario, as it involves a spontaneous act rather than a decision-making process.

Groupthink is a phenomenon where the desire for harmony or conformity in a group results in an irrational or dysfunctional decision-making outcome. This is not applicable here, as the scenario describes a spontaneous act of vandalism rather than a decision-making process.