Which Is Not a True Statement

Multiple Choice

Which is not a true statement?

A) Volcanic ash can form a depositional layer and can be used to date rocks because the ash deposit is the same age everywhere it got deposited
B) An iridium-rich clay layer from the debris of a giant meteorite impact can be used to date rocks because its presence in rock layers of the same age should be present
C) Individual sedimentary layers of similar composition can be used to date rocks because that rock type would have been deposited at the same geologic time
D) The presence of a single type of index fossil is sufficient to establish the relative age of a rock