Which early 20th century advertising pioneer first extensively used psychology in marketing campaigns, famously stating 'appeal to the masses, not the classes'?

The history of retail marketing has been shaped by revolutionary strategies and campaigns that forever changed how products are sold. This trivia question explores a pivotal moment in retail marketing history that transformed how businesses approached consumer psychology and established techniques still used today. Test your knowledge about this watershed moment in retail history that influenced generations of marketing professionals.

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Edward Bernays, who used Freudian psychology to link products to unconscious desires
John Wanamaker, who pioneered department store advertising with the phrase 'the customer is always right'
Claude Hopkins, who developed 'scientific advertising' and pioneered testimonials and sampling
Rosser Reeves, who created the 'Unique Selling Proposition' concept in the 1940s