The correct answer is D. Water
Step-by-step explanation:
Photosynthesis is a natural process carried out by plants, algae, and similar organisms to obtain energy by transforming sunlight into glucose or ATP. This process occurs in the chloroplast of plants and algae which is an organelle in their cells. Additionally, for photosynthesis, it is necessary plants have sunlight, water and carbon dioxide they use to obtain glucose and oxygen that is released as a product of this process. According to this, the molecule needed for photosynthesis to occur is water.