Answer: d. water
Step-by-step explanation:
Chemosynthesis can be define as a process of converting a form of carbon like carbon dioxide, and methane into organic molecules. Hydrogen sulfide is also used as a source of energy. Also the preserved oil can be used as a source of energy. Water generally produced as a byproduct of the chemosynthesis reaction. For example, the hydrogen sulfide is used as a source of energy for bacteria that live in the hydrothermal vents, the chemosynthesis results in the formation of water, sulfur and carbohydrates. The carbohydrate is used as source of chemical energy.