The Methanogenic Archaeans are ____ That Pull Electrons from ____

Question

The methanogenic archaeans are ____ that pull electrons from ____.  
A) chemoautotrophs; oxygen
B) chemoheterotrophs; carbon dioxide
C) chemoautotrophs; water
D) chemoheterotrophs; methane
E) chemoautotrophs; hydrogen gas

Accepted Answer

Methanogenic archaeans are chemoautotrophs (use inorganic compounds as energy source and CO2 as carbon source) that pull electrons from hydrogen gas (H2) to produce methane (CH4).