The correct option is A Chitin
Chitin is found in fungal cell wall. The major constituents of the fungal cell wall are chitin, glucans, and glycoproteins. The fungal cell wall is predominantly composed of carbohydrate polymers called chitin. Chitin is thought to mostly add structural strength to the cell wall.
Bacterial cell wall is made up of peptidoglycan . While plant cell wall is made up of cellulose and hemicellulose.
Hence the correct option is A.