The correct option is D ATP.
Adenosine triphosphate (ATP) is a nucleotide with three phosphates. It is the universal energy currency for all cellular metabolic processes. Endergonic processes are driven by energy input using hydrolysis of ATP. Exergonic processes are coupled to ATP synthesis. The process of ATP synthesis is called phosphorylation because ATP is synthesized by phosphorylation of adenosine diphosphate (ADP) or adenosine monophosphate (AMP). The energy obtained by a cell from catabolic reactions is stored immediately in the form of ATP, as it is the energy currency of the cell.