To Assign Absolute Dates to Fossils in This Sediment Core

To assign absolute dates to fossils in this sediment core, it would be most helpful if ________.

A) we knew the order in which the fossils occurred
B) the sediments had not been affected by underwater currents during their deposition
C) volcanic ash layers were regularly interspersed between the sedimentary strata
D) fossils throughout the column were equally spaced apart