Coal was created through the decomposition of ancient

a. trees
b. fish
c. bacteria
d animals

the answer is a trees.

The energy in coal comes from energy that was stored in giant plants that lived hundreds of millions of years ago in swamp forests, even before the dinosaurs! When these giant plants and ferns died, they formed layers at the bottom of the swamps. Water and dirt began to pile up on top of the dead plant remains. Hope this helps. ‍♀️

Answerprediction;