Help pls! making sure?

Question

Which best explains how coal deposits formed?

A. Dead plants compacted underground for hundreds of years eventually turned into coal.

B. Heat from the sun transformed decaying animals into coal over millions of years.

C. Natural gas solidified underground, creating coal.

D. Millions of years of pressure and heat turned decaying animals and plants into coal.

Answer 1

D

Answer 2

D.

Answer 3

D. offcource changing earth's temp. rising & falling of earth's water level ice age etc all are the causes of coal & other petroleum products we use today