What is moveable-type printing and who invented it in China?

What is moveable-type printing and who invented it in China?

• A. A woodblock skill; printing press by Peking University.
• B. A metal type printer; Wang Xizhi in Jin.
• C. A printing method using reusable types; Bi Sheng in the Song dynasty (11th century).
• D. A script writing technique; Cai Lun in Han.

Answer: (C)