Answer:
B. A source of energy.
Step-by-step explanation:
Adenine, a five-carbon sugar called ribose, and three phosphate groups make up the high-energy molecule known as ATP. In living things, it is largely employed as a source of energy. Every endergonic reaction that takes place in the body receives energy from ATP. For instance, the organism can use the energy from ATP to acquire, modify, and transfer things as well as to get rid of waste.