Energy source formed from the remains of ancient plants and animals plz guy

Fossil fuels  are the remains of ancient plants and animals that died millions of years ago. It is the remains of ancient plants, like trees and ferns. Oil and gas were formed at the bottom of oceans. They are the remains of billions of tiny marine plants and animals called plankton.

The  franco-prussian  war, a  war  that was  led by prussia a coalition of  german  states, defeated  france. the  war  was the end  of  french  hegemony in europe and resulted in a unified  germany.  i hope this !

The answer is d., a mountain.