Species A and species X are preserved as fossils in rock layers. Scientists have determined the relative ages of the fossils in the layers. A volcanic ash layer is preserved in the rock layers, as shown.
younger
ash layer
older
What is the most likely explanation for the change in fossils in the rock layers?
A Species X was a predator that caused species A to become extinct.
B Species X went extinct as the climate in the area changed.
C A volcanic eruption caused species A to become extinct.
D The climate before a volcanic eruption caused the extinction of species A.