Which early 20th century advertising pioneer first successfully used psychological research to develop product marketing campaigns, revolutionizing retail advertising?

The history of retail advertising has dramatically shaped how products reach consumers. From simple newspaper ads to sophisticated campaigns, advertising techniques evolved alongside societal changes. This poll tests your knowledge about a pivotal moment in retail advertising history that fundamentally changed how products were marketed to the masses and created techniques still used in modern campaigns.

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Edward Bernays, who applied his uncle Sigmund Freud's psychological theories to product marketing in the 1920s
P.T. Barnum, who introduced testimonial-based advertising for consumer goods in 1915
William Wrigley Jr., who created the first celebrity endorsement campaigns in 1908
Claude Hopkins, who invented A/B testing for newspaper advertisements in 1923