Concept:A multilingual person speaks many languages. The term for such a person is polyglot.
Explanation:Option A, bilingual, means knowing two languages.
Option B, monolingual, means knowing one language.
Option C, polyglot, comes from Greek words meaning many languages. It is the correct term for a multilingual person.
Option D, linguist, is a person who studies languages.
Since "polyglot" means speaking several languages, a multilingual person is also called a polyglot.
Answer:C. Polyglot