Answer:
d. carbohydrates
Step-by-step explanation:
Carbohydrates are the primary form of energy for the body, being converted into glucose in the metabolic processes in order to use it in various body functions.
They are found in several types of food (mostly of plant origin) and can be divided into three classes, which vary according to the amount of glucose atoms: monosaccharides, oligosaccharides and polysaccharides.