Correct Option: C

statement (Noun) : something that you say or write that gives information or an
opinion; a printed record of money paid, etc.
invoice (Noun) : bill; a list of goods that have been sold, work that has been done, etc., showing what you must pay
word (Noun) : a single unit of language which means something and can be spoken or written; a promise
sound (Noun) : noise
language (Noun) : the system of communication in speech and writing that is used by the people of a particular country or area