The best answer is D.
Plants need energy to grow and reproduce. This energy is gotten by the process of cellular respiration. This process uses carbohydrates as substrate .
To be able to get carbohydrates, plants, unlike animals, have to manufacture it. Animals do not make their own food but plants do.
The plants therefore must engage in photosynthesis to make carbohydrates and this requires light to provide solar energy to drive the process, thus most plants, especially green plants, must have sunlight , without which they cannot live.
