Please help! Which statement about Johannes Gutenberg is true?
A. He served as the head of the powerful weavers' guild in the German city-state of Augsburg.
B. He invented a printing press with moveable type and used it to make copies of the Bible.
C. He developed a new method of glassmaking that remained a closely guarded secret for centuries.
B. He proposed a new educational program that became known as humanism.