Which of the following statements about the information in the graph is most likely to be true? A.
Human activities contributed to the increase in carbon dioxide levels that occurred during the Jurassic geologic period.
B.
During the Permian geologic period, the amount of carbon dioxide in the atmosphere increased due to natural processes.
C.
Carbon dioxide levels are higher today than they have been at any other time in geologic history.
D.
During the Carboniferous geologic period, carbon dioxide levels reached their highest point in geologic history.