Which advertising technique did Duolingo use in its breakthrough 2019 campaign that dramatically increased user retention by leveraging linguistic anxiety?

In the world of language learning apps, marketing campaigns can make or break a product's success. One particular language learning platform revolutionized its market position through a clever advertising campaign that used linguistic psychology to create a viral sensation. This campaign fundamentally changed how language learning products are marketed worldwide and created unprecedented user engagement. Test your knowledge about this influential campaign that bridged linguistic science with innovative marketing.

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The 'Duo Push' campaign featuring an intimidating owl mascot sending increasingly urgent notifications, playing on fear of missing lessons
The 'Language Immersion' campaign offering users free international trips after completing 365 consecutive days of lessons
The 'Neural Mapping' campaign claiming their algorithm matched each user's unique brain patterns for optimal learning
The 'Celebrity Polyglot' campaign featuring famous multilingual celebrities sharing their learning journeys