Correct option is (c) Fleet
For explanation I would say: Fleet in 1991 described glucans into three classes: alkaline insoluble- acetic acid insoluble β-(1,3), alkali-soluble β-(1,3), and highly branched β-(1,6). Alkali-soluble accounts for 20% of the cell wall, alkaline insoluble- acetic acid insoluble accounts for 30% of the cell wall and highly branched accounts for only 5% of the cell wall.