Cellulose upon acetylation with excess acetic anhydride/`H_(2)SO_(4)` (catalytic) gives cellulose triacetate whose structure is

Answer

A

Explanation

Cellulose has `beta`-glycosidic linkages between `C_1` of one glucose unit and `C_(4)` of the other. It has three free OH groups at 2,3 and 6 positions, therefore , `Oac` groups appear at `C_2,C_3and C_6` positions, Thus , option (a) is correct.