Prior to Gutenberg’s development of the printing press, people in other societies – such as China and Korea - had produced similar machines. Which of these innovations made Gutenberg’s printing press truly revolutionary?

Responses
A Gutenberg used movable metal type.Gutenberg used movable metal type.
B Gutenberg created letters using wooden blocks.Gutenberg created letters using wooden blocks.
C Gutenberg only printed on silk, allowing a more colorful product.Gutenberg only printed on silk, allowing a more colorful product.
D Gutenberg used a rotary, or turning, press that speeded up the process.

A Gutenberg used movable metal type.