Which innovative retail strategy did Duolingo implement in 2020 that dramatically increased its user engagement among 18-24 year olds?

In the world of language learning products and linguistic services, marketing strategies have evolved significantly over the past decade. Companies have employed innovative techniques to position their language products in an increasingly competitive global market. This trivia question tests your knowledge about how a major language learning brand revolutionized its retail strategy to capture a new demographic.

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AI-powered personalized learning paths that adapted to regional dialect preferences
Gamified streak preservation through in-app purchases and retail gift cards
Linguistic augmented reality experiences in partnership with retail bookstores
Regional language ambassadors stationed in university campus stores