Correct Option: D

Glucose from glycogen is readily mobilized and is therefore a good source of energy for sudden, strenuous activity. Glucose that is not needed for energy is stored in the form of glycogen as a source of potential energy, readily available when needed. Most of the glycogen is stored in the liver and muscle cells. When these and other body cells are saturated with glycogen, the excess glucose is converted into fat and stored as adipose tissue.