The correct answer is (3) Ferdinand de Saussure because A Course in General Linguistics (French: Cours de linguistique générale) is a posthumous compilation of Saussure’s lecture notes on linguistics.
Although Saussure himself did not publish the book, his students compiled and edited the notes from his lectures at the University of Geneva, publishing them in 1916. This work laid the foundation for modern structural linguistics and influenced a wide range of disciplines, including semiotics, literary theory, and philosophy.
Here’s why the others are incorrect:
Roman Jakobson – A major figure in structural linguistics and phonology, but not the author of A Course in General Linguistics.
C.S. Peirce – Known as the founder of pragmatism and semiotics, but not involved with this work.
Julia Kristeva – A literary theorist and psychoanalyst; her work focuses on semiotics, intertextuality, and psychoanalysis, but she is not related to this text.
Thus, Ferdinand de Saussure is the correct answer.