Which innovative feature did Book of the Month Club introduce in 2016 that revolutionized the literary subscription model and significantly increased its appeal to millennial readers?

The publishing industry has been transformed by subscription models, particularly in the form of curated book boxes. These monthly or quarterly services deliver carefully selected books and book-related merchandise to subscribers, creating new revenue streams for publishers and authors while fostering reading communities. This trivia question explores how these literary subscription services have changed the way readers discover and consume literature in the digital age.

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A skip-month option allowing subscribers to opt out of receiving a book in any given month without cancelling their subscription
A book-matching algorithm that used artificial intelligence to recommend titles based on the subscriber's reading history
A social reading platform where subscribers could discuss their monthly selections in virtual book clubs
A write-your-own-ending program where subscribers could submit alternative conclusions to selected novels