Ans. Option (C).
A chemosynthetic organism is defined as an organism that derives energy from inorganic molecules (such as sulfur or hydrogen sulfide gas) to synthesize complex, organic molecules, like glucose.
Chemosynthesis is performed by some bacteria that live in hydrothermal vents, where sunlight is absent.
Thus, the correct answer is option C). 'it uses sulfur or other elements as a source of energy.'
