‘Demythologizing’ is a term associated with the works of

The correct option is Ferdinand de Saussure.

Ferdinand de Saussure was a pioneering Swiss linguist whose concepts laid the structural foundation for modern linguistics and semiology (the study of signs). In structuralist and post-structuralist thought, the process of "demythologizing"—or deconstructing cultural myths and belief systems—relies heavily on Saussure's analysis of how meaning is constructed.
Saussure introduced the idea that a linguistic sign is composed of two parts: the signifier (the form or sound-image) and the signified (the concept or mental representation). Crucially, he argued that the link between the signifier and the signified is arbitrary and established purely by social convention rather than any natural connection.

By demonstrating that meaning is not inherent or natural but is instead a product of cultural systems and relational differences, Saussure's framework enabled theorists to unpack and "demythologize" various social, literary, and cultural narratives. This approach exposes how ideological concepts, often presented as universal or natural truths, are actually constructed linguistic and semiotic systems.