Microbial Processes Take Place in

Microbial processes take place in

A) shallow subsurface where water flowing from the surface moves below the plant root zone.
B) regions where organic matter,originating from the Earth's surface in times past,has been transformed by chemical and biological processes to yield coal.
C) zones where methane is being synthesized as a result of microbial activity.
D) All of these choices are correct.