Which Statement Best Summarizes the Development of the Geologic Time

Multiple Choice

Which statement best summarizes the development of the geologic time scale?

A) Numerical ages for rocks were known before the relative sequence of sedimentary layers was established.
B) Relative ages for sedimentary strata were known before accurate numerical dates for these rocks were measured.
C) Names of relative ages (such as Silurian) and accurate numerical dates for these ages became known at about the same time.
D) Numerical ages for fossils were known before the relative sequence of sedimentary layers was established.