Of the Following,which Is the Most Abundant Source of Fossil

Of the following,which is the most abundant source of fossil evidence?

A) amber,because a large portion of Earth is vegetated and insects often become trapped in sap
B) sedimentary rock,because such rock forms in areas sediment moved by water can cause the burial of organisms
C) mud,because such material is heavy and organisms cannot escape from it easily
D) ice,because most of Earth has been covered in ice at some point or another