Starch is an example of

They are all carbohydrates, meaning they are generated from carbon, hydrogen, and oxygen.

Sugars are in the formation (CH2O)n, meaning they have "n" number of units of 1 carbon atom and 1 water "molecule."

Glycogen, starch, and cellulose are all polysaccharides, which are sugars bonded together through condensation (water-leaving) reactions.