The correct answer is option A, that is, the light-dependent reactions.
The light-dependent reactions are accountable for the generation of glucose molecules, with the use of water and carbon dioxide along with sunlight. In the process, the glucose is dissociated down by the process of respiration, in order to generate ATP in mitochondria.
The light-dependent reactions utilize light energy to produce two molecules required for the next level of photosynthesis, that is, the energy storing molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions occur in the thylakoid membranes of organelles known as chloroplasts.