Which innovative product development in the 15th century dramatically increased access to religious texts and is credited with helping spark the Protestant Reformation?

Religious texts and philosophical works have evolved dramatically in their production and distribution. From ancient hand-copied manuscripts to modern digital formats, the publishing industry has transformed how spiritual wisdom is shared. This poll explores a pivotal technological development that revolutionized access to sacred texts and had profound impacts on religious practice and philosophical discourse worldwide.

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Gutenberg's movable type printing press
The introduction of paper manufacturing from China to Europe
Leather-bound codex books replacing scrolls
Illuminated manuscript production techniques