Answer:
The correct option is A. Glucose
Step-by-step explanation:
Glucose is the main source of energy for cells. All cells of the body rely on glucose as the quickest source of fuel to carry out their functions.
In the process of glycolysis, glucose gets converted into pyruvate and is then transported to the mitochondria to carry out the reactions of the TCA cycle. In the mitochondria, glucose gets converted to ATP.
Energy is stored in the form of fats in the body. It is not the quickest source of energy.