Langue (A): This term refers to the abstract, systematic rules and conventions of a language shared by a speech community. It encompasses the underlying structure of a language. Thus, it matches with II. Socially shared language.
Parole (B): This term refers to the individual, concrete instances of speech or language use, essentially the actual utterances made by speakers. It corresponds to III. speech.
Signifier (C): This term refers to the physical form of a word or symbol—the word itself, which represents a concept. It matches with IV. word.
Signified (D): This term represents the concept or meaning that is associated with a signifier. Therefore, it corresponds to I. meaning conveyed.