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

The religious publishing industry has undergone significant transformations throughout history, adapting to cultural changes and technological advances. From ancient scrolls to modern apps, religious texts remain among the most published works worldwide. This poll explores a pivotal moment in religious text production that dramatically changed accessibility and influenced spiritual practice across denominations. Test your knowledge about this product development milestone!

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Gutenberg's movable type printing press, which first mass-produced the Bible
The development of vellum paper, making religious manuscripts more durable than papyrus
The creation of illuminated manuscripts with gold leaf illustrations
The standardization of Latin as the universal language for religious texts