​According to Ferdinand de Saussure, language is:

A. an interlocking structure.
B. a system of constant change.
C. a system of signs.
D. a self-standing formation.

Correct option is B

Explanation:

Ferdinand de Saussure, the Swiss linguist and semiotician, described language as:
A system of signs: Language is made up of signifiers (sound patterns) and signified (concepts). These are arbitrarily related and gain meaning through their differences from other signs.

A self-standing formation: Language operates as an autonomous system within its own structure and does not depend on external references for its functioning.
The incorrect options:

Information Booster:
Langue vs. Parole: Saussure distinguished between,
Langue: The structured system of a language shared by a community.
Parole: Individual speech acts.
Significance of Binary Oppositions: Language elements gain meaning by contrasting with others (e.g., cat vs. bat).
Arbitrariness of Signs: There is no inherent connection between the sound and the meaning of a word.

Additional Knowledge:
Saussure’s work laid the foundation for structuralism, a major intellectual movement in linguistics, anthropology, and literary theory.
His ideas are compiled in "Course in General Linguistics", published posthumously by his students.
Modern linguistic theories like semiotics and post-structuralism build upon his concepts.