Which Statement About Fossils Is False

Which statement about fossils is false?

A) The fossil record is most complete for marine animals that had hard skeletons.
B) Paleontologists have studied a large fraction of the sites that contain fossils.
C) Most organisms live and die in oxygen-rich environments.
D) Oxygen generally increases the rate of decomposition of fossils.
E) Fossils of similar organisms have been found in areas that are geographically far apart from one another.