Answer:
The correct answer would be ADP gains a phosphate group to create ATP, which stores energy for making sugars.
In light reaction of photosynthesis, ADP is phosphorylated to form ATP which is used in the dark reaction of the photosynthesis in order to fix the carbon obtained from carbon dioxide into the sugars or glucose.
A plant cell requires total of 9 ATP molecules and 6 NADPH inn order to fix one molecule of glucose.