The Chinese invented paper almost a thousand years before Europeans did. In A.D. 105 Ts'ai Lun found that plant fiber that was ground up and soaked in water would dry into a lightweight, usable material on which to write. A Chinese chemist, Bi Sheng, invented movable type in 1040, about 400 years before Johannes Gutenberg developed it in Germany. More than 1,000 years ago, the Chinese invented the magnetic compass. This led to long-distance ocean travel and worldwide exploration and trade.
The paragraph tells mainly__
(A) how to make paper and movable type.
(B) how Gutenberg learned from Ts’ai Lun.
(C) about Chinese inventions.
(D) about how the magnetic compass works.​