The correct option is CHINESE.
Chinese is the most spoken language in the world and it always comes on top of the list of the most common languages in the world. Although the language has many dialects, but put together, about 1.2 billion native speakers speak Chinese language. Mandarin is the most common dialect of the Chinese language.
I believe the term is Syntax.
Answer:
C... the main purpose of a suffix is to show what part of speech the word is...eg. noun or adjective