How do chemoautotrophs make energy?

AThey convert carbon dioxide, water, and inorganic compounds into carbohydrates.
BThey covert carbon dioxide, water, and sunlight into carbohydrates.
CThey convert carbon dioxide, water, and organic molecules to carbohydrates.
DThey convert carbon dioxide, sunlight, and organic molecules to carbohydrates.

Verified Answer :

A) They convert carbon dioxide, water, and inorganic compounds into carbohydrates.  I am pretty sure it the answer 

I think the correct answer from the choices listed above is option A. Chemoautotrophs make energy by converting carbon dioxide, water, and inorganic compounds into carbohydrates. These organisms uses inorganic energy sources. Hope this answers the question.