Answer:
b. Phosphate
Step-by-step explanation:
Adenosine Triphosphate (ATP) is an adenine nucleotide molecule with three phosphate groups. This molecule (ATP) is known as the energy currency of the cell because it releases energy by its hydrolysis to ADP and Phosphate. During ATP hydrolysis, the phosphate bonds are broken down, and this energy is used to power different cellular activities.