Aresearcher discovers a new bacterium that lives on the seafloor near hydrothermal vents. this organism reduces co2 to form c6h12o6 (glucose), and also derives energy from h2 (by oxidation). this bacterium is a:
a. photoautotroph.
b. chemoheterotroph.
c. chemoautotroph.
d. photoheterotroph.

C. Chemoautotroph

Explanation:

The new bacterium are able to create their own energy and biological materials  (glucose) from inorganic chemicals (CO2 and H2), therefore they are called chemoautotroph.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

the answer is b & c i believe : )