Which product development innovation by Gutenberg in the 15th century revolutionized religious accessibility and is credited with helping spark the Protestant Reformation?

Throughout history, religious organizations have engaged in product development to spread their teachings and sustain their communities. From ancient scrolls to modern apps, the evolution of religious products reflects both theological priorities and cultural shifts. This poll tests your knowledge about a significant innovation in religious product development that transformed spiritual practice and accessibility.

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Mass production of printed Bibles using movable type printing press
Creation of illustrated prayer books with gold leaf embellishments
Development of the first leather-bound portable scripture
Introduction of multilingual parallel text religious commentaries