The correct option is B Chloroplast
ATP is the standard energy currency in a cell. The ATP can be readily synthesized from ADP by a process, which is called phosphorylation in which a phosphate residue is added to ADP. The phosphorylation can be carried out by three methods. They are oxidative phosphorylation, substrate level phosphorylation and photophosphorylation. When phosphorylation occurs in presence of light in chloroplast, it is called photophosphorylation.