The diagram shows fossil layers in different locations. The different shading in the diagram indicates different types of rock. How could fossils like the ones shown support the theory of evolution?

A. Fossil evidence supports the hypothesis that evolution can occur at different rates in different clades.
B. Fossil evidence supports the hypothesis that individual organisms and populations evolve to adapt to a changing environment.
C. Fossil evidence provides a complete record of the organisms that once lived and are ancestors to other organisms.
D. Fossil evidence provides information on the allele frequency in ancestral populations.