Which famous 1940s advertising campaign was so successful it transformed De Beers' diamond business and created the tradition that an engagement ring should cost approximately two months' salary?

Before digital marketing and social media campaigns, companies had to find innovative ways to capture public attention. Throughout history, certain advertising campaigns fundamentally changed how products were marketed and became cultural touchstones. This trivia question explores one such pivotal moment in advertising history that transformed an entire industry's approach to marketing.

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"A Diamond is Forever" campaign by N.W. Ayer & Son
"Reach for a Lucky Instead of a Sweet" campaign by Lucky Strike
"The Pause That Refreshes" campaign by Coca-Cola
"Good to the Last Drop" campaign by Maxwell House