Which marketing campaign introduced the concept of 'comprehensible input' to mainstream language learning and revolutionized the industry with its 'natural approach' messaging?

In the world of language learning and linguistics, marketing campaigns have played crucial roles in popularizing certain approaches and methodologies. These campaigns often shape public perception of language acquisition and influence how we think about communication skills. This poll tests your knowledge about a groundbreaking marketing campaign that fundamentally altered the language learning landscape and introduced a revolutionary concept that remains influential today.

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Rosetta Stone's 'Language Learning Like a Child' campaign (2003)
Stephen Krashen and Tracy Terrell's 'The Natural Approach' promotional tour (1983)
Pimsleur's 'Speak Like a Diplomat' campaign (1998)
Berlitz's 'Think In The Language' global marketing push (1992)