Which scenario demonstrates the bandwagon effect?

• A. Many people buy a product because others are buying it.
• B. A scientist experiments with a control group.
• C. A single critic challenges a claim with evidence.
• D. A writer presents a persuasive argument based on data.

Answer: (A)

Bandwagon effect shows up when people adopt something primarily because many others are doing it, using the crowd as a signal that the choice is worthwhile. In this scenario, the decision to buy a product is driven by seeing others buy it, which is a classic example of social proof influencing behavior. The other situations involve scientific testing, critical evaluation with evidence, or data-based persuasion, none of which rely on following the crowd.