The chinese written language maintained its unique quality because of

a. the isolationist nature of ancient china.

b. its unifying role within the society.

c. its rejection by the koreans and japanese.

d. the ambiguity of its characters.

e. its adoption by the peoples of northern india.

The correct answer is b. its unifying role within the society.

It unified Chinese people and they used it all instead of developing their own types of written language based on various parts of the continent from which they might come. Other countries even adopted the system like Japan who adopted the iconography, but not the meaning and reading of the words.