Which statement BEST describes the relationship between adenosine diphosphate (ADP and adenosine triphosphate (ATP)?
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A. With an input of energy, ADP rearranges to become ATP.
B. Without any energy change, ADP rearranges to become ATP.
• C. With an input of energy, ADP combines with a phosphate group to become ATP.
O D. With a release of energy, ADP combines with a phosphate group to become ATP.