Which fact is the basis for using the fossil record as evidence that evolution has taken place?

Question

A. In rock layers, the older fossils are found in the deeper layers
B. There are fossils of all life-forms to be found in rock layers.
C. All fossils were formed at the same time.
D. Fossils have been shown to provide a complete record of human evolution

Answer 1

A. In rock layers, the older fossils are found in the deeper layers