Answer:
The correct answer is c reducing agent.
Step-by-step explanation:
Photosynthesis consist of both light reaction and dark reaction.The light reaction result in the formation of ATP and NADPH.The so formed ATP and NADPH are used in dark reaction to fix CO2 resulting in the production of glucose.The principle of ATP to provide energy to carry out the CO2 fixation process of dark reaction.
NADPH act as a reducing agent that reduces the phosphoglyceric acid(PGA) into phosphoglyceraldehyde(PGALD).