Which sentence correctly describes how an organism's remains become fossils?
A
The sun, wind, and earth conspire to dry out an organism's
remains, thereby protecting them from the common causes of
decay.
B
An organism's remains sometimes get covered with mud and
dirt which hardens, forming a protective layer around them.
С
Plant growth helps preserve an organism's remains by forming a
protective wall of biological matter around them.
D
The moisture beneath the Earth's crust helps to petrify the
bones and other calcium rich organic remains, thereby
protecting them from the elements of decay.