Which Statement Best Describes How the Interconversion of ATP and ADP

Which statement best describes how the interconversion of ATP and ADP is responsible for storing and providing energy for cellular reactions?

A) Energy is stored in ADP and released when ADP adds a phosphate group.
B) Energy is stored in ADP and released when ATP undergoes hydrolysis.
C) Energy is stored in ATP and released when ADP undergoes phosphorylation.
D) Energy is stored in ATP and released when ATP undergoes hydrolysis.
E) Energy requiring reactions of the cell drive the phosphorylation of ADP.