Paper was invented in China about 1900 years ago, by a man named _______.

The correct option is B Cai Lun.
Cai Lun is regarded as the inventor of paper and the papermaking process in 105 AD. He created a sheet of paper using mulberry and other bast fibres along with fishnets, old rags, and hemp waste. He took paper beyond being a technical invention and helped drive its widespread adoption such that it became a successful innovation.