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a.) phosphorylation

ATP usually releases energy by breaking down the weak phosphate cell present.  The energy released due to the breaking down of the phosphate cell is then utilized. The ATP is converted to ADP. Whenever a cell feels the necessity for energy it releases a phosphate to gather the energy. It is an automatic and ongoing process. The weak bond between the second and the third phosphate is always targeted for turning ATP to ADP. This is the reason ATP is considered the main energy currency for the cell. 

Answer;

C.) dephosphorylation

Explanation;

-ATP is an important molecule that acts as a source of cellular energy that is used to drive cellular processes. It also acts as a storage molecule of energy for future use.

-For a molecule of ATP to release energy that is stored in the phosphate bonds, it is dephosphorylated to ADP and inorganic phosphate.

That is; ATP = ADP + Pi (inorganic phosphate).

-Dephosphorylation involves the removal of a phosphate (PO43−) group from an organic compound by hydrolysis.