Which product innovation is credited with dramatically increasing Bible ownership and contributing to the Protestant Reformation in the 16th century?

Throughout history, religious texts have been among the most important products ever created, with their production methods evolving dramatically over time. From hand-copied manuscripts to modern digital formats, the way sacred texts have been produced and distributed has shaped religious practice worldwide. This poll tests your knowledge about a pivotal moment in religious publishing history that transformed access to sacred texts.

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Gutenberg's movable type printing press
The development of parchment paper
The creation of illuminated manuscripts
The invention of leather-bound book covers