When ATP Releases Some Energy, It Also Releases Inorganic Phosphate

Multiple Choice

When ATP releases some energy, it also releases inorganic phosphate. What purpose does this serve (if any) in the cell?

A) The phosphate is released as an excretory waste.
B) The phosphate can only be used to regenerate more ATP.
C) The phosphate can be added to water and excreted as a liquid.
D) The phosphate may be incorporated into any molecule that contains phosphate.
E) It enters the nucleus to affect gene expression.