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