The Coal Beds We Now Mine for Energy Are Largely

The coal beds we now mine for energy are largely the remains of

A) plants that grew in swamps during the Carboniferous period.
B) algae that grew in marshes during the Devonian period.
C) giant insects and amphibians of the Permian period.
D) plants that grew in the oceans during the Carboniferous period.
E) None of the above