Which of the following polymers of glucose is stored by animals?

Glycogen is the polymer of glucose stored by animals, it is analogous to starch and sometimes referred as animal starch and serves as long term energy storage in animals, therefore, option (iv) is correct answer.

Cellulose is structural polymer of glucose units found in plants, amylose and amylopectin are the polysaccharides found in starch granules. therefore options (i),(ii),(iii) are incorrect answers.