Which marketing innovation in the 15th century most dramatically increased access to religious texts and contributed to the Protestant Reformation?

Throughout history, religious organizations have employed various marketing strategies to distribute sacred texts and spread their teachings. From ancient scrolls to digital platforms, the methods of disseminating religious knowledge have evolved dramatically. This trivia question focuses on a pivotal innovation in religious text distribution that revolutionized access to spiritual teachings. Test your knowledge about this significant marketing milestone in religious history!

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Gutenberg's printing press, which allowed mass production of Bibles in vernacular languages
The creation of illuminated manuscripts with gold leaf, making religious texts more visually appealing
The development of subscription-based monastic libraries where people could borrow religious texts
The establishment of university scriptoriums that employed students to copy texts at lower costs