Today,the Fossil Record

Today,the fossil record

A) can be dated only in terms of how layers relate to each other (i.e.older layers are below younger layers) ; no actual dates can be estimated.
B) can be dated reasonably well only with uranium-238.
C) can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
D) can be dated precisely,to within a single year,using radioactive isotopes.
E) can be dated precisely,to within a single year,using DNA hybridization.